├── .gitignore ├── LICENSE.txt ├── README.md ├── assets ├── demo-local.gif └── logo.png ├── cmd ├── delete.go ├── retrieve.go ├── root.go └── store.go ├── go.mod ├── go.sum ├── internal ├── encryption │ ├── encryptor.go │ └── settings.go └── logging │ └── logger.go ├── main.go └── pkg ├── errors.go ├── gasper.go ├── shares ├── file.go └── share.go └── storage └── stores ├── errors.go ├── factory.go ├── local.go └── store.go /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled Object files, Static and Dynamic libs (Shared Objects) 2 | *.o 3 | *.a 4 | *.so 5 | 6 | # Folders 7 | _obj 8 | _test 9 | 10 | # Architecture specific extensions/prefixes 11 | *.[568vq] 12 | [568vq].out 13 | 14 | *.cgo1.go 15 | *.cgo2.c 16 | _cgo_defun.c 17 | _cgo_gotypes.go 18 | _cgo_export.* 19 | 20 | _testmain.go 21 | 22 | # Vim files https://github.com/github/gitignore/blob/master/Global/Vim.gitignore 23 | # swap 24 | [._]*.s[a-w][a-z] 25 | [._]s[a-w][a-z] 26 | # session 27 | Session.vim 28 | # temporary 29 | .netrwhist 30 | *~ 31 | # auto-generated tag files 32 | tags 33 | 34 | *.exe 35 | cobra.test 36 | bin 37 | 38 | .idea/ 39 | *.iml -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 |

2 | Gasper Logo 3 |

4 | 5 | 6 | # Gasper 7 | 8 | ![](https://img.shields.io/github/issues/talhof8/gasper) 9 | ![](https://img.shields.io/github/stars/talhof8/gasper) 10 | ![](https://img.shields.io/github/license/talhof8/gasper) 11 | ![](https://img.shields.io/twitter/url?url=https%3A%2F%2Fgithub.com%2Ftalhof8%2Fgasper) 12 | 13 | Back-up & encrypt your files in a distributed manner, across multiple stores of your choice, by splitting them to shares. 14 | Retrieve them at any point, with only a minimum number of shares required for retrieval. 15 | 16 | Each file is being split to multiple shares, all of which are distributed to different destinations defined by you (be it AWS S3, Dropbox, Google Drive, your local filesystem, FTP Server, etc...). You can retrieve your file at any given moment, even if you only have access to a part of the stores you originally used (down to a minimium threshold of your choice). 17 | 18 | Gasper is based on the awesome [Shamir's Secret Sharing algorithm](https://en.wikipedia.org/wiki/Shamir%27s_Secret_Sharing). 19 | 20 |

21 | Shamir's Secret Sharing
22 | Source: Robin's Snippet blog 23 |

24 | 25 | # Demo 26 | #### Using local store 27 | ![](assets/demo-local.gif) 28 | 29 | ## Supported stores 30 | 31 | | Type | Description | Attributes | 32 | | ----------------- |-----------------------| --------------------------| 33 | | `local` | Store share in a local directory | `directory-path` (string) | 34 | 35 | Feel free to contribute your own stores - S3, Google Drive, Twitter, FTP, or anything else you'd like :) 36 | 37 | ### Adding a new store 38 | 1. Implement the `Store` interface (`pkg/storage/stores/store.go`): 39 | 40 | ``` 41 | // Store lets you store shares. 42 | type Store interface { 43 | // Store type. 44 | Type() string 45 | 46 | // Is store available? 47 | // Useful especially for remote stores, such as ftp servers or s3 buckets. 48 | Available() (bool, error) 49 | 50 | // Puts a share in store. 51 | Put(share *shares.Share) error 52 | 53 | // Retrieves a share from store. 54 | // If no share with the given File ID exists, returns ErrShareNotExists. 55 | Get(fileID string) (*shares.Share, error) 56 | 57 | // Deletes a share from store. 58 | // If no share with the given File ID exists, returns ErrShareNotExists. 59 | Delete(fileID string) error 60 | } 61 | ``` 62 | 2. Add it to the stores factory function `FromConfig()` (`pkg/storage/stores/factory.go`), so it can be used out-of-the-box in the CLI. 63 | 3. Enjoy! 64 | 65 | For an example, see `pkg/storage/stores/local.go`. 66 | 67 | ## Installation 68 | ``` 69 | go get -u github.com/talhof8/gasper 70 | ``` 71 | 72 | ## Usage 73 | #### Store 74 | ``` 75 | gasper store --stores-config --file [--encrypt --salt --share-count --shares-threshold --verbose] 76 | ``` 77 | Outputs file ID and checksum on success which should be used for retrieval. 78 | 79 | #### Retrieve 80 | ``` 81 | gasper retrieve --stores-config --file-id --destination [--checksum --encrypt --salt --verbose] 82 | ``` 83 | 84 | #### Delete 85 | Best effort deletion. 86 | ``` 87 | gasper delete --stores-config --file-id [--verbose] 88 | ``` 89 | 90 | Stores configuration file: 91 | ``` 92 | { 93 | "stores": [ 94 | { 95 | "type": "", 96 | "": "", 97 | "": "", 98 | "": "" 99 | }, 100 | { 101 | "type": "", 102 | "": "", 103 | ... 104 | } 105 | ] 106 | } 107 | ``` 108 | 109 | ## License 110 | Gasper is released under GPL. See LICENSE.txt. 111 | -------------------------------------------------------------------------------- /assets/demo-local.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/talhof8/gasper/b1b55c473c0180f47235d3e7c60af561de84d4f1/assets/demo-local.gif -------------------------------------------------------------------------------- /assets/logo.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/talhof8/gasper/b1b55c473c0180f47235d3e7c60af561de84d4f1/assets/logo.png -------------------------------------------------------------------------------- /cmd/delete.go: -------------------------------------------------------------------------------- 1 | package cmd 2 | 3 | import ( 4 | "github.com/gasper/internal/encryption" 5 | "github.com/gasper/pkg" 6 | storesPkg "github.com/gasper/pkg/storage/stores" 7 | "github.com/spf13/cobra" 8 | "go.uber.org/zap" 9 | ) 10 | 11 | func init() { 12 | deleteCmd.PersistentFlags().StringVarP(&fileID, "file-id", "i", "", 13 | "file id to retrieve (required)") 14 | 15 | if err := deleteCmd.MarkPersistentFlagRequired("file-id"); err != nil { 16 | panic("Failed to mark 'file-id' flag as required") 17 | } 18 | 19 | rootCmd.AddCommand(deleteCmd) 20 | } 21 | 22 | var deleteCmd = &cobra.Command{ 23 | Use: "delete", 24 | Short: "Delete a file", 25 | Long: "Delete a file from the provided stores", 26 | Run: func(cmd *cobra.Command, args []string) { 27 | gasper, err := pkg.NewGasper(extractStores(), &encryption.Settings{ 28 | TurnedOn: false, 29 | }) 30 | if err != nil { 31 | zap.L().Fatal("Failed to initialize Gasper", zap.Error(err)) 32 | } 33 | 34 | deletedShares := 0 35 | 36 | zap.L().Info("Delete shares from stores") 37 | for _, store := range gasper.Stores() { 38 | store := store 39 | storeType := store.Type() 40 | 41 | if skip := checkStoreAvailability(store); skip { 42 | continue 43 | } 44 | 45 | zap.L().Debug("Available! Delete file from store", zap.String("StoreType", storeType)) 46 | if err := store.Delete(fileID); err != nil { 47 | if err == storesPkg.ErrShareNotExists { 48 | zap.L().Debug("No match found in store, trying the next one", zap.String("StoreType", 49 | storeType)) 50 | continue 51 | } 52 | 53 | zap.L().Error("Failed to delete share from store", zap.String("StoreType", storeType), 54 | zap.Error(err)) 55 | continue // Best effort - keep trying other stores... 56 | } 57 | 58 | deletedShares++ 59 | } 60 | 61 | if deletedShares == 0 { 62 | zap.L().Warn("No shares were found/deleted") 63 | return 64 | } 65 | 66 | zap.L().Info("File shares deleted successfully.", zap.String("FileID", fileID), 67 | zap.Int("DeletedShares", deletedShares)) 68 | }, 69 | } 70 | -------------------------------------------------------------------------------- /cmd/retrieve.go: -------------------------------------------------------------------------------- 1 | package cmd 2 | 3 | import ( 4 | "github.com/gasper/internal/encryption" 5 | "github.com/gasper/pkg" 6 | sharesPkg "github.com/gasper/pkg/shares" 7 | storesPkg "github.com/gasper/pkg/storage/stores" 8 | "github.com/spf13/cobra" 9 | "go.uber.org/zap" 10 | ) 11 | 12 | var ( 13 | fileID string 14 | destination string 15 | checksum string 16 | decryptionTurnedOn bool 17 | decryptionSalt string 18 | ) 19 | 20 | func init() { 21 | retrieveCmd.PersistentFlags().StringVarP(&fileID, "file-id", "i", "", 22 | "file id to retrieve (required)") 23 | retrieveCmd.PersistentFlags().StringVarP(&destination, "destination", "d", "", 24 | "where to save the retrieved file (required)") 25 | retrieveCmd.PersistentFlags().StringVarP(&checksum, "checksum", "m", "", 26 | "checksum of the shared file (required)") 27 | retrieveCmd.PersistentFlags().BoolVarP(&decryptionTurnedOn, "decrypt", "e", false, 28 | "whether file was encrypted before storing it (default: false)") 29 | retrieveCmd.PersistentFlags().StringVarP(&decryptionSalt, "salt", "s", "", 30 | "decryption salt (required if decryption mode is turned on)") 31 | 32 | if err := retrieveCmd.MarkPersistentFlagRequired("file-id"); err != nil { 33 | panic("Failed to mark 'file-id' flag as required") 34 | } else if err := retrieveCmd.MarkPersistentFlagRequired("destination"); err != nil { 35 | panic("Failed to mark 'destination' flag as required") 36 | } else if err := retrieveCmd.MarkPersistentFlagRequired("checksum"); err != nil { 37 | panic("Failed to mark 'checksum' flag as required") 38 | } 39 | 40 | rootCmd.AddCommand(retrieveCmd) 41 | } 42 | 43 | var retrieveCmd = &cobra.Command{ 44 | Use: "retrieve", 45 | Short: "Retrieve a file", 46 | Long: "Retrieve a file from the provided stores", 47 | Run: func(cmd *cobra.Command, args []string) { 48 | if decryptionTurnedOn && decryptionSalt == "" { 49 | zap.L().Fatal("Decryption salt is required when decryption mode is turned on") 50 | } 51 | 52 | gasper, err := pkg.NewGasper(extractStores(), &encryption.Settings{ 53 | TurnedOn: decryptionTurnedOn, 54 | Salt: decryptionSalt, 55 | }) 56 | if err != nil { 57 | zap.L().Fatal("Failed to initialize Gasper", zap.Error(err)) 58 | } 59 | 60 | sharedFile := &sharesPkg.SharedFile{ 61 | ID: fileID, 62 | Checksum: checksum, 63 | Shares: make([]*sharesPkg.Share, 0), 64 | } 65 | 66 | zap.L().Info("Collect shares from stores") 67 | for _, store := range gasper.Stores() { 68 | store := store 69 | storeType := store.Type() 70 | 71 | if skip := checkStoreAvailability(store); skip { 72 | continue 73 | } 74 | 75 | zap.L().Debug("Available! Search share in store", zap.String("StoreType", storeType)) 76 | share, err := store.Get(fileID) 77 | if err != nil { 78 | if err == storesPkg.ErrShareNotExists { 79 | zap.L().Debug("No match found in store, trying the next one", zap.String("StoreType", 80 | storeType)) 81 | continue 82 | } 83 | 84 | zap.L().Error("Failed to search share in store", zap.String("StoreType", storeType), 85 | zap.Error(err)) 86 | continue 87 | } 88 | 89 | sharedFile.Shares = append(sharedFile.Shares, share) 90 | } 91 | 92 | if len(sharedFile.Shares) == 0 { 93 | zap.L().Warn("No shares found for requested file ID", zap.String("FileID", fileID)) 94 | return 95 | } else if len(sharedFile.Shares) < int(minSharesThreshold) { 96 | zap.L().Warn("Didn't find enough shares", zap.Int8("Need", minSharesThreshold), 97 | zap.Int("Got", len(sharedFile.Shares))) 98 | return 99 | } 100 | 101 | zap.L().Debug("Dump shared file") 102 | if err := gasper.DumpSharedFile(sharedFile, destination); err != nil { 103 | zap.L().Error("Failed dump shared file", zap.String("FileID", fileID), 104 | zap.String("Destination", destination), zap.Error(err)) 105 | return 106 | } 107 | 108 | zap.L().Info("File retrieved successfully.", zap.String("FileID", fileID)) 109 | }, 110 | } 111 | -------------------------------------------------------------------------------- /cmd/root.go: -------------------------------------------------------------------------------- 1 | package cmd 2 | 3 | import ( 4 | "fmt" 5 | "github.com/gasper/internal/logging" 6 | storesPkg "github.com/gasper/pkg/storage/stores" 7 | "github.com/spf13/cobra" 8 | "github.com/spf13/viper" 9 | "go.uber.org/zap" 10 | "os" 11 | ) 12 | 13 | var ( 14 | storesFile string 15 | verbose bool 16 | ) 17 | 18 | var rootCmd = &cobra.Command{ 19 | Use: "gasper", 20 | Short: "Gasper lets you store files in a distributed manner on all sorts of different stores", 21 | Long: "Back-up your files in a distributed manner, across multiple stores of your choice.\n" + 22 | "Retrieve them at any point, with only a minimum number of them required for retrieval.", 23 | PersistentPreRunE: func(cmd *cobra.Command, args []string) error { 24 | logger, err := logging.NewLogger("gasper", verbose) 25 | if err != nil { 26 | return err 27 | } 28 | 29 | zap.ReplaceGlobals(logger) 30 | return nil 31 | }, 32 | PersistentPostRun: func(cmd *cobra.Command, args []string) { 33 | _ = zap.L().Sync() 34 | _ = zap.S().Sync() 35 | }, 36 | } 37 | 38 | func init() { 39 | rootCmd.PersistentFlags().StringVarP(&storesFile, "stores-config", "c", "", "stores config file (required)") 40 | rootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "extra verbosity") 41 | 42 | if err := rootCmd.MarkPersistentFlagRequired("stores-config"); err != nil { 43 | panic("Failed to mark 'stores-config' flag as required") 44 | } 45 | } 46 | 47 | func extractStores() []storesPkg.Store { 48 | config := viper.New() 49 | config.SetConfigFile(storesFile) 50 | if err := config.ReadInConfig(); err != nil { 51 | zap.L().Fatal("Failed to read stores config file", zap.String("Path", filePath), zap.Error(err)) 52 | } 53 | 54 | storesConfigRaw := config.Get("stores") 55 | if storesConfigRaw == nil { 56 | zap.L().Fatal("Empty stores config") 57 | } 58 | 59 | storesConfig, ok := storesConfigRaw.([]interface{}) 60 | if !ok { 61 | zap.L().Fatal("Invalid configuration scheme") 62 | } 63 | 64 | stores := make([]storesPkg.Store, 0) 65 | for _, storeConfig := range storesConfig { 66 | storeConfigMap, ok := storeConfig.(map[string]interface{}) 67 | if !ok { 68 | zap.L().Fatal("Invalid configuration scheme") 69 | } 70 | 71 | store, err := storesPkg.FromConfig(storeConfigMap) 72 | if err != nil { 73 | zap.L().Fatal("Failed to create store from config", zap.Any("RawConfig", storeConfig), 74 | zap.Error(err)) 75 | } 76 | 77 | stores = append(stores, store) 78 | } 79 | return stores 80 | } 81 | 82 | func checkStoreAvailability(store storesPkg.Store) bool { 83 | storeType := store.Type() 84 | 85 | zap.L().Debug("Check store availability", zap.String("StoreType", storeType)) 86 | available, err := store.Available() 87 | if err != nil { 88 | zap.L().Warn("Store availability check failed", zap.String("StoreType", storeType), zap.Error(err)) 89 | return true 90 | } else if !available { 91 | zap.L().Debug("Skipping unavailable store", zap.String("StoreType", storeType)) 92 | return true 93 | } 94 | 95 | return false 96 | } 97 | 98 | func Execute() { 99 | if err := rootCmd.Execute(); err != nil { 100 | fmt.Println(err) 101 | os.Exit(1) 102 | } 103 | } 104 | -------------------------------------------------------------------------------- /cmd/store.go: -------------------------------------------------------------------------------- 1 | package cmd 2 | 3 | import ( 4 | "github.com/gasper/internal/encryption" 5 | "github.com/gasper/pkg" 6 | storesPkg "github.com/gasper/pkg/storage/stores" 7 | "github.com/spf13/cobra" 8 | "go.uber.org/zap" 9 | ) 10 | 11 | var ( 12 | filePath string 13 | shareCount int8 14 | minSharesThreshold int8 15 | encryptionTurnedOn bool 16 | encryptionSalt string 17 | ) 18 | 19 | func init() { 20 | storeCmd.PersistentFlags().StringVarP(&filePath, "file", "f", "", 21 | "file to store (required)") 22 | storeCmd.PersistentFlags().Int8VarP(&shareCount, "share-count", "a", 2, 23 | "share count (default: 2)") 24 | storeCmd.PersistentFlags().Int8VarP(&minSharesThreshold, "shares-threshold", "t", 2, 25 | "threshold of minimum shares which can be used for retrieval (default: 2)") 26 | storeCmd.PersistentFlags().BoolVarP(&encryptionTurnedOn, "encrypt", "e", false, 27 | "whether to encrypt file (AES) before storing it (default: false)") 28 | storeCmd.PersistentFlags().StringVarP(&encryptionSalt, "salt", "s", "", 29 | "32-byte long encryption salt (required if encryption mode is turned on)") 30 | 31 | if err := storeCmd.MarkPersistentFlagRequired("file"); err != nil { 32 | panic("Failed to mark 'file' flag as required") 33 | } 34 | 35 | rootCmd.AddCommand(storeCmd) 36 | } 37 | 38 | var storeCmd = &cobra.Command{ 39 | Use: "store", 40 | Short: "Store a file", 41 | Long: "Store a file on the provided stores", 42 | Run: func(cmd *cobra.Command, args []string) { 43 | if minSharesThreshold > shareCount { 44 | zap.L().Fatal("Minimum shares threshold cannot be larger than share count") 45 | } else if encryptionTurnedOn && encryptionSalt == "" { 46 | zap.L().Fatal("Encryption salt is required when encryption mode is turned on") 47 | } 48 | 49 | gasper, err := pkg.NewGasper(extractStores(), &encryption.Settings{ 50 | TurnedOn: decryptionTurnedOn, 51 | Salt: decryptionSalt, 52 | }) 53 | if err != nil { 54 | zap.L().Fatal("Failed to initialize Gasper", zap.Error(err)) 55 | } 56 | 57 | zap.L().Info("Getting file shares") 58 | sharedFile, err := gasper.SharesFromFile(filePath, byte(shareCount), byte(minSharesThreshold)) 59 | if err != nil { 60 | zap.L().Fatal("Failed to get file shares", zap.Error(err)) 61 | } 62 | 63 | zap.L().Info("Check general stores availability") 64 | stores := gasper.Stores() 65 | availableStores := make([]storesPkg.Store, 0, len(stores)) 66 | for _, store := range stores { 67 | if skip := checkStoreAvailability(store); skip { 68 | continue 69 | } 70 | 71 | availableStores = append(availableStores, store) 72 | } 73 | 74 | availableStoresCount := len(availableStores) 75 | if int(minSharesThreshold) > availableStoresCount { 76 | zap.L().Error("Not enough available stores", zap.Int8("Need", minSharesThreshold), 77 | zap.Int("Got", availableStoresCount), zap.Int8("Recommended", shareCount)) 78 | return 79 | } 80 | 81 | zap.L().Info("Put shares in stores") 82 | i := 0 83 | for _, share := range sharedFile.Shares { 84 | if i > len(stores)-1 { 85 | zap.L().Error("All stores exhausted") 86 | return 87 | } 88 | 89 | store := stores[i] 90 | storeType := store.Type() 91 | i++ 92 | 93 | zap.L().Debug("Available! Put share in store", zap.String("StoreType", storeType), 94 | zap.String("ShareID", share.ID)) 95 | if err := store.Put(share); err != nil { 96 | zap.L().Error("Failed to put share in store", zap.String("StoreType", storeType), 97 | zap.Error(err)) 98 | continue 99 | } 100 | } 101 | 102 | zap.L().Info("Success! Keep the following info for later use", zap.String("FileID", sharedFile.ID), 103 | zap.String("Checksum", sharedFile.Checksum)) 104 | }, 105 | } 106 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/gasper 2 | 3 | go 1.13 4 | 5 | require ( 6 | github.com/codahale/sss v0.0.0-20160501174526-0cb9f6d3f7f1 7 | github.com/dustinkirkland/golang-petname v0.0.0-20191129215211-8e5a1ed0cff0 8 | github.com/pkg/errors v0.9.1 9 | github.com/spf13/cobra v1.0.0 10 | github.com/spf13/pflag v1.0.5 // indirect 11 | github.com/spf13/viper v1.7.1 12 | go.uber.org/zap v1.16.0 13 | ) 14 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 2 | cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 3 | cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= 4 | cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= 5 | cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= 6 | cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= 7 | cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= 8 | cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o= 9 | cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE= 10 | cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk= 11 | cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I= 12 | cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw= 13 | dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU= 14 | github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ= 15 | github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= 16 | github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo= 17 | github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= 18 | github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= 19 | github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= 20 | github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o= 21 | github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8= 22 | github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY= 23 | github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8= 24 | github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q= 25 | github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8= 26 | github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs= 27 | github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84= 28 | github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc= 29 | github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= 30 | github.com/codahale/sss v0.0.0-20160501174526-0cb9f6d3f7f1 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github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4= 99 | github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ= 100 | github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO+LraFDTW64= 101 | github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ= 102 | github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2pPBoIllUwCN7I= 103 | github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc= 104 | github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM= 105 | github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8= 106 | github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo= 107 | github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU= 108 | github.com/jstemmer/go-junit-report 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h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= 342 | rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= 343 | -------------------------------------------------------------------------------- /internal/encryption/encryptor.go: -------------------------------------------------------------------------------- 1 | package encryption 2 | 3 | import ( 4 | "crypto/aes" 5 | "crypto/cipher" 6 | "crypto/rand" 7 | "github.com/pkg/errors" 8 | ) 9 | 10 | // todo: make an interface and support other types of encryption. 11 | type Encryptor struct { 12 | settings *Settings 13 | } 14 | 15 | func NewEncryptor(settings *Settings) *Encryptor { 16 | return &Encryptor{settings: settings} 17 | } 18 | 19 | func (e *Encryptor) Encrypt(data []byte) ([]byte, error) { 20 | if !e.settings.TurnedOn { 21 | return data, nil 22 | 23 | } 24 | 25 | blockCipher, err := e.newAesCipher() 26 | if err != nil { 27 | return nil, errors.WithMessage(err, "new AES cipher") 28 | } 29 | 30 | gcm, err := e.newGCM(blockCipher) 31 | if err != nil { 32 | return nil, errors.WithMessage(err, "new GCM") 33 | } 34 | 35 | nonce := make([]byte, gcm.NonceSize()) 36 | if _, err = rand.Read(nonce); err != nil { 37 | return nil, errors.WithMessage(err, "read random nonce") 38 | } 39 | 40 | ciphertext := gcm.Seal(nonce, nonce, data, nil) 41 | return ciphertext, nil 42 | } 43 | 44 | func (e *Encryptor) Decrypt(data []byte) ([]byte, error) { 45 | if !e.settings.TurnedOn { 46 | return data, nil 47 | } 48 | 49 | blockCipher, err := e.newAesCipher() 50 | if err != nil { 51 | return nil, errors.WithMessage(err, "new aes cipher") 52 | } 53 | 54 | gcm, err := e.newGCM(blockCipher) 55 | if err != nil { 56 | return nil, errors.WithMessage(err, "new GCM") 57 | } 58 | 59 | nonce, ciphertext := data[:gcm.NonceSize()], data[gcm.NonceSize():] 60 | 61 | plaintext, err := gcm.Open(nil, nonce, ciphertext, nil) 62 | if err != nil { 63 | return nil, errors.WithMessage(err, "open GCM") 64 | } 65 | return plaintext, nil 66 | } 67 | 68 | func (e *Encryptor) newAesCipher() (cipher.Block, error) { 69 | return aes.NewCipher(e.saltBytes()) 70 | } 71 | 72 | func (e *Encryptor) newGCM(blockCipher cipher.Block) (cipher.AEAD, error) { 73 | return cipher.NewGCM(blockCipher) 74 | } 75 | 76 | func (e *Encryptor) saltBytes() []byte { 77 | return []byte(e.settings.Salt) 78 | } 79 | -------------------------------------------------------------------------------- /internal/encryption/settings.go: -------------------------------------------------------------------------------- 1 | package encryption 2 | 3 | import "errors" 4 | 5 | type Settings struct { 6 | TurnedOn bool 7 | Salt string 8 | } 9 | 10 | func (s *Settings) Validate() error { 11 | if s.TurnedOn { 12 | saltBytes := []byte(s.Salt) 13 | k := len(saltBytes) 14 | 15 | switch k { 16 | default: 17 | return errors.New("salt needs to be either 16, 24, or 32-byte long") 18 | case 16, 24, 32: 19 | return nil 20 | } 21 | } 22 | 23 | return nil 24 | } 25 | -------------------------------------------------------------------------------- /internal/logging/logger.go: -------------------------------------------------------------------------------- 1 | package logging 2 | 3 | import ( 4 | "github.com/pkg/errors" 5 | "go.uber.org/zap" 6 | ) 7 | 8 | func NewLogger(name string, verbose bool) (*zap.Logger, error) { 9 | var ( 10 | logger *zap.Logger 11 | err error 12 | ) 13 | 14 | if verbose { 15 | logger, err = zap.NewDevelopment() 16 | } else { 17 | logger, err = zap.NewProduction() 18 | } 19 | 20 | if err != nil { 21 | return nil, errors.WithMessage(err, "new logger") 22 | } 23 | 24 | return logger.Named(name), nil 25 | } 26 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "github.com/gasper/cmd" 5 | ) 6 | 7 | func main() { 8 | cmd.Execute() 9 | } 10 | -------------------------------------------------------------------------------- /pkg/errors.go: -------------------------------------------------------------------------------- 1 | package pkg 2 | 3 | import "github.com/pkg/errors" 4 | 5 | var ( 6 | ErrInvalidSharesThreshold = errors.New("minimum shares threshold cannot be larger than share count") 7 | ErrNilSharedFile = errors.New("nil shared file") 8 | ) 9 | -------------------------------------------------------------------------------- /pkg/gasper.go: -------------------------------------------------------------------------------- 1 | package pkg 2 | 3 | import ( 4 | "crypto/md5" 5 | "encoding/hex" 6 | "github.com/codahale/sss" 7 | petname "github.com/dustinkirkland/golang-petname" 8 | "github.com/gasper/internal/encryption" 9 | sharesPkg "github.com/gasper/pkg/shares" 10 | storesPkg "github.com/gasper/pkg/storage/stores" 11 | "github.com/pkg/errors" 12 | "io/ioutil" 13 | "math/rand" 14 | "os" 15 | "strconv" 16 | "time" 17 | ) 18 | 19 | // todo: more elegant and efficient way to read & write big files. 20 | 21 | const ( 22 | fileIDWordCount = 2 23 | fileIDWordSeparator = "-" 24 | ) 25 | 26 | // Gasper lets you store, load, and delete files in a multi-part, distributed manner, using on Shamir's Secret Sharing. 27 | // It holds a list of stores being used for distribution, and encryption settings. 28 | type Gasper struct { 29 | stores []storesPkg.Store 30 | encryptor *encryption.Encryptor 31 | } 32 | 33 | func NewGasper(stores []storesPkg.Store, encryptionSettings *encryption.Settings) (*Gasper, error) { 34 | if err := encryptionSettings.Validate(); err != nil { 35 | return nil, errors.WithMessage(err, "validate encryption settings") 36 | } 37 | 38 | return &Gasper{ 39 | stores: stores, 40 | encryptor: encryption.NewEncryptor(encryptionSettings), 41 | }, nil 42 | } 43 | 44 | // Retrieves stores. 45 | func (g *Gasper) Stores() []storesPkg.Store { 46 | return g.stores 47 | } 48 | 49 | // Splits file into its shares. 50 | func (g *Gasper) SharesFromFile(filePath string, shareCount, minSharesThreshold byte) (*sharesPkg.SharedFile, error) { 51 | if minSharesThreshold > shareCount { 52 | return nil, ErrInvalidSharesThreshold 53 | } 54 | 55 | fileID := g.uniqueFileId() 56 | 57 | data, err := ioutil.ReadFile(filePath) 58 | if err != nil { 59 | return nil, errors.WithMessagef(err, "read file '%s'", filePath) 60 | } 61 | 62 | encryptedData, err := g.encryptor.Encrypt(data) 63 | if err != nil { 64 | return nil, errors.WithMessage(err, "encrypt data") 65 | } 66 | 67 | sharesBytes, err := sss.Split(shareCount, minSharesThreshold, encryptedData) 68 | if err != nil { 69 | return nil, errors.WithMessage(err, "split data to shares") 70 | } 71 | 72 | shares := make([]*sharesPkg.Share, 0, len(sharesBytes)) 73 | for shareID, shareBytes := range sharesBytes { 74 | share := &sharesPkg.Share{ 75 | ID: strconv.Itoa(int(shareID)), 76 | FileID: fileID, 77 | Data: shareBytes, 78 | } 79 | 80 | shares = append(shares, share) 81 | } 82 | 83 | checksum := md5.Sum(data) 84 | 85 | return &sharesPkg.SharedFile{ 86 | ID: fileID, 87 | Checksum: hex.EncodeToString(checksum[:]), 88 | Shares: shares, 89 | }, nil 90 | } 91 | 92 | func (g *Gasper) uniqueFileId() string { 93 | rand.Seed(time.Now().UnixNano()) 94 | return petname.Generate(fileIDWordCount, fileIDWordSeparator) 95 | } 96 | 97 | // Dumps shared file to a local filesystem destination. 98 | // If md5 checksum is set, will use it to check file authenticity, otherwise will skip checksum check. 99 | func (g *Gasper) DumpSharedFile(sharedFile *sharesPkg.SharedFile, destination string) error { 100 | if sharedFile == nil { 101 | return ErrNilSharedFile 102 | } 103 | 104 | rawShares := make(map[byte][]byte, len(sharedFile.Shares)) 105 | for _, share := range sharedFile.Shares { 106 | shareIDInt, err := strconv.Atoi(share.ID) 107 | if err != nil { 108 | return errors.WithMessage(err, "convert share ID from string to int") 109 | } 110 | rawShares[byte(shareIDInt)] = share.Data 111 | } 112 | 113 | combinedBytes := sss.Combine(rawShares) 114 | 115 | decryptedData, err := g.encryptor.Decrypt(combinedBytes) 116 | if err != nil { 117 | return errors.WithMessage(err, "decrypt data") 118 | } 119 | 120 | if sharedFile.Checksum != "" { 121 | if err := g.validateChecksum(decryptedData, sharedFile.Checksum); err != nil { 122 | return err 123 | } 124 | } 125 | 126 | if err := ioutil.WriteFile(destination, decryptedData, os.ModePerm); err != nil { 127 | return errors.WithMessagef(err, "write file '%s'", destination) 128 | } 129 | return nil 130 | } 131 | 132 | func (g *Gasper) validateChecksum(decryptedData []byte, originalChecksum string) error { 133 | currentChecksumBytes := md5.Sum(decryptedData) 134 | currentChecksum := hex.EncodeToString(currentChecksumBytes[:]) 135 | 136 | if currentChecksum != originalChecksum { 137 | return errors.Errorf("got corrupt data, checksums didn't match (original: '%s', got: '%s')", 138 | originalChecksum, currentChecksum) 139 | } 140 | return nil 141 | } 142 | -------------------------------------------------------------------------------- /pkg/shares/file.go: -------------------------------------------------------------------------------- 1 | package shares 2 | 3 | type SharedFile struct { 4 | ID string 5 | Checksum string 6 | Shares []*Share 7 | } 8 | -------------------------------------------------------------------------------- /pkg/shares/share.go: -------------------------------------------------------------------------------- 1 | package shares 2 | 3 | type Share struct { 4 | ID string 5 | FileID string 6 | Data []byte 7 | } 8 | -------------------------------------------------------------------------------- /pkg/storage/stores/errors.go: -------------------------------------------------------------------------------- 1 | package stores 2 | 3 | import "github.com/pkg/errors" 4 | 5 | var ( 6 | ErrShareNotExists = errors.New("share doesn't exist in store") 7 | ErrMoreThanOneMatch = errors.New("found more than one match for share") 8 | 9 | // Missing/invalid config attributes errors. 10 | ErrInvalidStoreType = errors.New("invalid store type") 11 | ErrMissingStoreTypeAttr = errors.New("missing store type") 12 | ErrMissingDirectoryPathAttr = errors.New("missing 'directory-path' attribute") 13 | ErrInvalidDirectoryPathAttr = errors.New("invalid 'directory-path' attribute (strings only)") 14 | ) 15 | -------------------------------------------------------------------------------- /pkg/storage/stores/factory.go: -------------------------------------------------------------------------------- 1 | package stores 2 | 3 | func FromConfig(config map[string]interface{}) (Store, error) { 4 | storeType, ok := config["type"] 5 | if !ok { 6 | return nil, ErrMissingStoreTypeAttr 7 | } 8 | 9 | switch storeType { 10 | case TypeLocalStore: 11 | return localStore(config) 12 | } 13 | 14 | return nil, ErrInvalidStoreType 15 | } 16 | 17 | func localStore(config map[string]interface{}) (Store, error) { 18 | directoryPathRaw, ok := config["directory-path"] 19 | if !ok { 20 | return nil, ErrMissingDirectoryPathAttr 21 | } 22 | 23 | directoryPath, ok := directoryPathRaw.(string) 24 | if !ok { 25 | return nil, ErrInvalidDirectoryPathAttr 26 | } 27 | 28 | return NewLocalStore(directoryPath) 29 | } 30 | -------------------------------------------------------------------------------- /pkg/storage/stores/local.go: -------------------------------------------------------------------------------- 1 | package stores 2 | 3 | import ( 4 | "fmt" 5 | "github.com/gasper/pkg/shares" 6 | "github.com/pkg/errors" 7 | "io/ioutil" 8 | "os" 9 | "path" 10 | "path/filepath" 11 | "strings" 12 | ) 13 | 14 | const TypeLocalStore = "local" 15 | 16 | // Stores files in a local directory. 17 | // Note: needs to get an absolute path. 18 | type LocalStore struct { 19 | directoryPath string 20 | } 21 | 22 | func NewLocalStore(directoryPath string) (*LocalStore, error) { 23 | return &LocalStore{ 24 | directoryPath: directoryPath, 25 | }, nil 26 | } 27 | 28 | func (ls *LocalStore) Type() string { 29 | return TypeLocalStore 30 | } 31 | 32 | func (ls *LocalStore) Available() (bool, error) { 33 | _, err := os.Stat(ls.directoryPath) 34 | if err != nil { 35 | if os.IsNotExist(err) { 36 | return false, nil 37 | } 38 | return false, err 39 | } 40 | return true, err 41 | } 42 | 43 | func (ls *LocalStore) Put(share *shares.Share) error { 44 | filePath := path.Join(ls.directoryPath, ls.filename(share)) 45 | return ioutil.WriteFile(filePath, share.Data, os.ModePerm) 46 | } 47 | 48 | func (ls *LocalStore) Get(fileID string) (*shares.Share, error) { 49 | filePath, err := ls.findFileByID(fileID) 50 | if err != nil { 51 | return nil, err 52 | } 53 | 54 | data, err := ioutil.ReadFile(filePath) 55 | if err != nil { 56 | return nil, errors.WithMessagef(err, "read file '%s'", filePath) 57 | } 58 | 59 | splitFilename := strings.Split(path.Base(filePath), ".") 60 | if len(splitFilename) != 3 { // Note: should not happen, otherwise glob wouldn't match. But just in case... 61 | return nil, errors.New("invalid file format (should be: '..gasper')") 62 | } 63 | 64 | shareID := splitFilename[1] 65 | 66 | return &shares.Share{ 67 | ID: shareID, 68 | FileID: fileID, 69 | Data: data, 70 | }, nil 71 | } 72 | 73 | func (ls *LocalStore) Delete(fileID string) error { 74 | filePath, err := ls.findFileByID(fileID) 75 | if err != nil { 76 | return err 77 | } 78 | 79 | return os.RemoveAll(filePath) 80 | } 81 | 82 | func (ls *LocalStore) filename(share *shares.Share) string { 83 | return fmt.Sprintf("%s.%s.gasper", share.FileID, share.ID) 84 | } 85 | 86 | func (ls *LocalStore) findFileByID(fileID string) (string, error) { 87 | pattern := path.Join(ls.directoryPath, fmt.Sprintf("%s.*.gasper", fileID)) 88 | matches, err := filepath.Glob(pattern) 89 | if err != nil { 90 | return "", errors.WithMessagef(err, "glob pattern '%s'", pattern) 91 | } 92 | 93 | if len(matches) == 0 { 94 | return "", ErrShareNotExists 95 | } else if len(matches) > 1 { 96 | return "", ErrMoreThanOneMatch 97 | } 98 | 99 | return matches[0], nil 100 | } 101 | -------------------------------------------------------------------------------- /pkg/storage/stores/store.go: -------------------------------------------------------------------------------- 1 | package stores 2 | 3 | import "github.com/gasper/pkg/shares" 4 | 5 | // Store lets you store shares. 6 | type Store interface { 7 | // Store type. 8 | Type() string 9 | 10 | // Is store available? 11 | // Useful especially for remote stores, such as ftp servers or s3 buckets. 12 | Available() (bool, error) 13 | 14 | // Puts a share in store. 15 | Put(share *shares.Share) error 16 | 17 | // Retrieves a share from store. 18 | // If no share with the given File ID exists, returns ErrShareNotExists. 19 | Get(fileID string) (*shares.Share, error) 20 | 21 | // Deletes a share from store. 22 | // If no share with the given File ID exists, returns ErrShareNotExists. 23 | Delete(fileID string) error 24 | } 25 | --------------------------------------------------------------------------------