├── .gitignore ├── Dockerfile ├── LICENSE ├── README.html ├── README.md ├── README.org ├── filter ├── filter.go └── generate.go ├── fly.toml ├── go.mod ├── go.sum └── rssc.go /.gitignore: -------------------------------------------------------------------------------- 1 | # If you prefer the allow list template instead of the deny list, see community template: 2 | # https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore 3 | # 4 | # Binaries for programs and plugins 5 | *.exe 6 | *.exe~ 7 | *.dll 8 | *.so 9 | *.dylib 10 | 11 | # Test binary, built with `go test -c` 12 | *.test 13 | 14 | # Output of the go coverage tool, specifically when used with LiteIDE 15 | *.out 16 | 17 | # Dependency directories (remove the comment below to include it) 18 | # vendor/ 19 | 20 | # Go workspace file 21 | go.work 22 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | # Use the official Golang base image 2 | FROM golang:latest 3 | 4 | # Set the working directory inside the container 5 | WORKDIR /app 6 | 7 | # Copy the Go source code into the container 8 | COPY . . 9 | 10 | # Build the Go application 11 | RUN go build -o myapp 12 | 13 | # Expose port 8080 (if your app listens on this port) 14 | EXPOSE 8080 15 | 16 | # Define the entry point for your application 17 | CMD ["./myapp"] 18 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 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.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 8 | rssc - rss customizer 9 | 171 | 172 | 173 |
174 |

rssc - rss customizer

175 |
176 |

rssc provides a real-time, self-hostable regex-oriented 177 | customization service for atom, rss and json feeds.

178 |

Usage

179 |

rssc uses get request parameters to read user's preferences. 180 | following are the supported parameters:

181 |
    182 |
  • 183 | src: the source URL of the feeds. Example: 184 | https://hnrss.org/newest 186 |
    • 187 |
  • t: the type of desired feeds (that rssc will 188 | return), can be rss, atom or 189 | json.
    • 190 |
  • descriptionf: regular expression filter to 191 | filter feeds based on the description property.
    • 192 |
  • titlef: regular expression filter to filter 193 | feeds based on the title property.
    • 194 |
  • contentf: regular expression filter to filter 195 | feeds based on the content property.
    • 196 |
  • linkf: regular expression filter to filter 197 | feeds based on the link property.
    • 198 |
  • net: boolean (1 or 0) (default to 0 when 199 | omitted) whether to use the .NET engine regex instead of 200 | Go's.
    • 201 |
202 |

All regex should be valid RE2 regex syntax 204 | (in case of net, see 206 | MS' Regular Expression Language).

207 |

Examples

208 |

Replace https://rssc.fly.dev/ in the 210 | following examples with your instance of rssc (can be a 211 | localhost:8080 if self-hosted).

212 |
    213 |
  • 214 |

    Get all new feeds that contain the word "emacs" but not 215 | the word "vim", and not posted by user lr0 (hnrss.org does 216 | not provide a creator/author property, so the author filter 217 | here is only for a demonstration purpose.):

    218 |

    219 | https://rssc.fly.dev/rss?src=https://hnrss.org/newest?q=emacs&titlef=^(?!.*\bvim\b).*\bEmacs\b.*&net=1&authorf=^(?!.*\blr0\b).*$

    220 |

    Do note that net is used here because RE2 221 | does not support lookarounds.

    222 |
    • 223 |
  • 224 |

    Get geopolitical updates from your favorite hacker and 225 | skip all free software movement blessed propaganda:

    226 |

    227 | https://rssc.fly.dev/rss?src=https://stallman.org/rss/rss.xml&contentf=^(?=.*(?:palestine|syria|egypt|iraq|israel|algeria|morocco))(?!.*(?:linux|gnu|software|programming|program)).*$&net=1

    228 |
    • 229 |
  • 230 |

    Get BBC middle east updates, only ones that are related to 231 | Palestine:

    232 |

    233 | https://rssc.fly.dev/rss?src=http://feeds.bbci.co.uk/news/world/middle_east/rss.xml&titlef=(?i)palestine|palestinian|gaza

    234 |
    • 235 |
236 |

Self-host

237 |

To host rssc locally, install it using Go:

238 | 
go install github.com/larrasket/rssc@latest
240 |
241 |

Set environment variable for PORT, if user 242 | doesn't set a PORT value, rssc will use 243 | :8080 by default.

244 | 
PORT=4040 rssc
245 |
246 |

Now rssc should be running at localhost:4040. You 247 | can use the same examples provided, with 248 | replacing fly domain with your localhost.

249 |

Notes

250 |
    251 |
  • RE2 is much safer than the .NET Regex, that's to say, all 252 | the good features that .NET engine enables you to use come with 253 | a risk cost and ends up enabling 255 | catastrophic backtracking, therefore a timeout of 5 256 | seconds is currently enabled on the fly.dev instance when 257 | using net=1. 258 |
    • 259 |
  • rssc is pre-alpha. Please report bugs here (url) 262 |
    • 263 |
264 | 265 | 266 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | rssc provides a real-time, self-hostable regex-oriented customization service for atom, 2 | rss and json feeds. 3 | 4 | 5 | # Usage 6 | 7 | rssc uses get request parameters to read user’s preferences. following are the 8 | supported parameters: 9 | 10 | - `src`: the source URL of the feeds. Example: 11 | - `t`: the type of desired feeds (that rssc will return), can be `rss`, `atom` or `json`. 12 | - `descriptionf`: regular expression filter to filter feeds based on the description property. 13 | - `titlef`: regular expression filter to filter feeds based on the title property. 14 | - `contentf`: regular expression filter to filter feeds based on the content property. 15 | - `linkf`: regular expression filter to filter feeds based on the link property. 16 | - `net`: boolean (1 or 0) (default to 0 when omitted) whether to use the .NET 17 | engine regex instead of Go’s. 18 | 19 | All regex should be valid [RE2 regex syntax](https://github.com/google/re2/wiki/Syntax) (in case of `net`, see [MS’ Regular Expression Language](https://learn.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-language-quick-reference)). 20 | 21 | 22 | 23 | 24 | # Examples 25 | 26 | Replace in the following examples with your instance of 27 | rssc (can be a `localhost:8080` if self-hosted). 28 | 29 | - Get all new feeds that contain the word “emacs” but not the word “vim”, and 30 | not posted by user lr0 (hnrss.org does not provide a creator/author property, 31 | so the author filter here is only for a demonstration purpose.): 32 | 33 | [https://rssc.fly.dev/rss?src=https://hnrss.org/newest?q=emacs&titlef=^(?!.\*\bvim\b).\*\bEmacs\b.\*&net=1&authorf=^(?!.\*\blr0\b).\*$](https://rssc.fly.dev/rss?src=https://hnrss.org/newest?q=emacs&titlef=^(?!.*\bvim\b).*\bEmacs\b.*&net=1&authorf=^(?!.*\blr0\b).*$) 34 | 35 | Do note that `net` is used here because RE2 does not support lookarounds. 36 | 37 | - Get geopolitical updates from your favorite hacker and skip all free software 38 | movement blessed propaganda: 39 | 40 | [https://rssc.fly.dev/rss?src=https://stallman.org/rss/rss.xml&contentf=^(?=.\*(?:palestine|syria|egypt|iraq|israel|algeria|morocco))(?!.\*(?:linux|gnu|software|programming|program)).\*$&net=1](https://rssc.fly.dev/rss?src=https://stallman.org/rss/rss.xml&contentf=^(?=.*(?:palestine|syria|egypt|iraq|israel|algeria|morocco))(?!.*(?:linux|gnu|software|programming|program)).*$&net=1) 41 | - Get BBC middle east updates, only ones that are related to Palestine: 42 | 43 | [https://rssc.fly.dev/rss?src=http://feeds.bbci.co.uk/news/world/middle\_east/rss.xml&titlef=(?i)palestine|palestinian|gaza](https://rssc.fly.dev/rss?src=http://feeds.bbci.co.uk/news/world/middle_east/rss.xml&titlef=(?i)palestine|palestinian|gaza) 44 | 45 | 46 | # Self-host 47 | 48 | To host rssc locally, install it using Go: 49 | 50 | go install github.com/larrasket/rssc@latest 51 | 52 | Set environment variable for `PORT`, if user doesn’t set a `PORT` value, rssc will use `:8080` by default. 53 | 54 | PORT=4040 rssc 55 | 56 | Now rssc should be running at `localhost:4040`. You can use the same [examples](#ex) 57 | provided, with replacing fly domain with your localhost. 58 | 59 | 60 | # Notes 61 | 62 | - RE2 is much safer than the .NET Regex, that’s to say, all the good features 63 | that .NET engine enables you to use come with a risk cost and ends up 64 | enabling [catastrophic backtracking](https://github.com/dlclark/regexp2#catastrophic-backtracking-and-timeouts), therefore a timeout of 5 seconds is currently 65 | enabled on the fly.dev instance when using `net=1`. 66 | - rssc is pre-alpha. Please report bugs [here](mailto:~lr0/public-inbox@lists.sr.ht) ([url](https://lists.sr.ht/~lr0/public-inbox)) 67 | 68 | -------------------------------------------------------------------------------- /README.org: -------------------------------------------------------------------------------- 1 | #+TITLE: rssc - rss customizer 2 | #+OPTIONS: num:nil 3 | #+OPTIONS: toc:nil 4 | #+OPTIONS: ^:nil 5 | #+OPTIONS: author:nil 6 | 7 | 8 | rssc provides a real-time, self-hostable regex-oriented customization service for atom, 9 | rss and json feeds. 10 | 11 | * Usage 12 | rssc uses get request parameters to read user's preferences. following are the 13 | supported parameters: 14 | + ~src~: the source URL of the feeds. Example: https://hnrss.org/newest 15 | + ~t~: the type of desired feeds (that rssc will return), can be ~rss~, ~atom~ or ~json~. 16 | + ~descriptionf~: regular expression filter to filter feeds based on the description property. 17 | + ~titlef~: regular expression filter to filter feeds based on the title property. 18 | + ~contentf~: regular expression filter to filter feeds based on the content property. 19 | + ~linkf~: regular expression filter to filter feeds based on the link property. 20 | + ~net~: boolean (1 or 0) (default to 0 when omitted) whether to use the .NET 21 | engine regex instead of Go's. 22 | 23 | All regex should be valid [[https://github.com/google/re2/wiki/Syntax][RE2 regex syntax]] (in case of ~net~, see [[https://learn.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-language-quick-reference][MS' Regular Expression Language]]). 24 | * Examples 25 | :PROPERTIES: 26 | :CUSTOM_ID: ex 27 | :END: 28 | Replace https://rssc.fly.dev/ in the following examples with your instance of 29 | rssc (can be a ~localhost:8080~ if self-hosted). 30 | 31 | + Get all new feeds that contain the word "emacs" but not the word "vim", and 32 | not posted by user lr0 (hnrss.org does not provide a creator/author property, 33 | so the author filter here is only for a demonstration purpose.): 34 | 35 | ~https://rssc.fly.dev/rss?src=https://hnrss.org/newest?q=emacs&titlef=^(?!.*\bvim\b).*\bEmacs\b.*&net=1&authorf=^(?!.*\blr0\b).*$~ 36 | 37 | Do note that ~net~ is used here because RE2 does not support lookarounds. 38 | + Get geopolitical updates from your favorite hacker and skip all free software 39 | movement blessed propaganda: 40 | 41 | ~https://rssc.fly.dev/rss?src=https://stallman.org/rss/rss.xml&contentf=^(?=.*(?:palestine|syria|egypt|iraq|israel|algeria|morocco))(?!.*(?:linux|gnu|software|programming|program)).*$&net=1~ 42 | + Get BBC middle east updates, only ones that are related to Palestine: 43 | 44 | ~https://rssc.fly.dev/rss?src=http://feeds.bbci.co.uk/news/world/middle_east/rss.xml&titlef=(?i)palestine|palestinian|gaza~ 45 | 46 | * Self-host 47 | To host rssc locally, install it using Go: 48 | #+begin_src shell 49 | go install github.com/larrasket/rssc@latest 50 | #+end_src 51 | 52 | Set environment variable for ~PORT~, if user doesn't set a ~PORT~ value, rssc will use ~:8080~ by default. 53 | 54 | #+begin_src shell 55 | PORT=4040 rssc 56 | #+end_src 57 | 58 | Now rssc should be running at ~localhost:4040~. You can use the same [[#ex][examples]] 59 | provided, with replacing fly domain with your localhost. 60 | * Notes 61 | + RE2 is much safer than the .NET Regex, that's to say, all the good features 62 | that .NET engine enables you to use come with a risk cost and ends up 63 | enabling [[https://github.com/dlclark/regexp2#catastrophic-backtracking-and-timeouts][catastrophic backtracking]], therefore a timeout of 5 seconds is currently 64 | enabled on the fly.dev instance when using ~net=1~. 65 | + rssc is pre-alpha. Please report bugs [[mailto:~lr0/public-inbox@lists.sr.ht][here]] ([[https://lists.sr.ht/~lr0/public-inbox][url]]) 66 | -------------------------------------------------------------------------------- /filter/filter.go: -------------------------------------------------------------------------------- 1 | package filter 2 | 3 | import ( 4 | "context" 5 | "regexp" 6 | "time" 7 | 8 | "github.com/dlclark/regexp2" 9 | "github.com/mmcdole/gofeed" 10 | "github.com/pkg/errors" 11 | ) 12 | 13 | type FilterPrams struct { 14 | URL, 15 | AuthorRegex, 16 | ContentRegex, 17 | TitleRegex, 18 | LinkRegex, 19 | DescriptionRegex string 20 | DotNet bool // whether to use .NET Regex Engineg 21 | } 22 | 23 | // var tmpf FilterPrams = FilterPrams{TitleRegex: `\bAnalysis\b`} 24 | // FilterFeed("https://hnrss.org/newest", &tmpf) 25 | 26 | // Filter `url` based on `prams` if `prams` is nil (or all filters are empty) 27 | // return the original feeds 28 | func FilterFeeds(prams *FilterPrams) (*gofeed.Feed, error) { 29 | ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second) 30 | defer cancel() 31 | 32 | fp := gofeed.NewParser() 33 | feeds, err := fp.ParseURLWithContext(prams.URL, ctx) 34 | if err != nil { 35 | return nil, errors.Wrapf(err, "couldn't read feeds %s ", prams.URL) 36 | } 37 | 38 | if prams == nil || 39 | len(prams.AuthorRegex)+len(prams.ContentRegex)+ 40 | len(prams.TitleRegex)+len(prams.DescriptionRegex)+len(prams.LinkRegex) == 0 { 41 | return feeds, nil 42 | } 43 | if prams.DotNet { 44 | return withDotNETRegex(feeds, prams) 45 | } 46 | return withRE2(feeds, prams) 47 | } 48 | 49 | // Implements filtering for Google's RE2 standards 50 | func withRE2(feeds *gofeed.Feed, prams *FilterPrams) (*gofeed.Feed, error) { 51 | var authorF, contentF, titleF, descriptionF, linkF *regexp.Regexp 52 | 53 | // validate filters 54 | authorF, err := validateRE2(prams.AuthorRegex) 55 | if err != nil { 56 | return nil, err 57 | } 58 | 59 | contentF, err = validateRE2(prams.ContentRegex) 60 | if err != nil { 61 | return nil, err 62 | } 63 | 64 | titleF, err = validateRE2(prams.TitleRegex) 65 | if err != nil { 66 | return nil, err 67 | } 68 | 69 | descriptionF, err = validateRE2(prams.DescriptionRegex) 70 | if err != nil { 71 | return nil, err 72 | } 73 | 74 | linkF, err = validateRE2(prams.LinkRegex) 75 | if err != nil { 76 | return nil, err 77 | } 78 | 79 | // I considered using the new Slices.Delete function instead of building new 80 | // a new feeds; however "Delete is O(len(s)-j)" (from current go docs), I 81 | // think we can save some overhead by doing it by hand. 82 | fitlerd := []*gofeed.Item{} 83 | for _, i := range feeds.Items { 84 | // search authors 85 | if authorF != nil { 86 | match := false 87 | for _, a := range i.Authors { 88 | if authorF.MatchString(a.Name) { 89 | fitlerd = append(fitlerd, i) 90 | match = true 91 | break 92 | } 93 | } 94 | if match { 95 | continue 96 | } 97 | } 98 | // search content 99 | if contentF != nil && contentF.MatchString(i.Content) { 100 | fitlerd = append(fitlerd, i) 101 | continue 102 | } 103 | // search title 104 | if titleF != nil && titleF.MatchString(i.Title) { 105 | fitlerd = append(fitlerd, i) 106 | continue 107 | } 108 | // search link 109 | if linkF != nil && linkF.MatchString(i.Link) { 110 | fitlerd = append(fitlerd, i) 111 | continue 112 | } 113 | // search description 114 | if descriptionF != nil && descriptionF.MatchString(i.Description) { 115 | fitlerd = append(fitlerd, i) 116 | } 117 | } 118 | feeds.Items = fitlerd 119 | return feeds, nil 120 | } 121 | 122 | // Implements filtering for Microsoft's .NET regex engine 123 | // TODO refactor 124 | func withDotNETRegex(feeds *gofeed.Feed, prams *FilterPrams) (*gofeed.Feed, error) { 125 | var authorF, contentF, titleF, descriptionF, linkF *regexp2.Regexp 126 | 127 | // validate filters 128 | authorF, err := validateNET(prams.AuthorRegex) 129 | if err != nil { 130 | return nil, err 131 | } 132 | 133 | contentF, err = validateNET(prams.ContentRegex) 134 | if err != nil { 135 | return nil, err 136 | } 137 | 138 | titleF, err = validateNET(prams.TitleRegex) 139 | if err != nil { 140 | return nil, err 141 | } 142 | 143 | descriptionF, err = validateNET(prams.DescriptionRegex) 144 | if err != nil { 145 | return nil, err 146 | } 147 | 148 | linkF, err = validateNET(prams.LinkRegex) 149 | if err != nil { 150 | return nil, err 151 | } 152 | 153 | // I considered using the new Slices.Delete function instead of building new 154 | // a new feeds; however "Delete is O(len(s)-j)" (from current go docs), I 155 | // think we can save some overhead by doing it by hand. 156 | fitlerd := []*gofeed.Item{} 157 | for _, i := range feeds.Items { 158 | // search authors 159 | if authorF != nil { 160 | match := false 161 | for _, a := range i.Authors { 162 | p, err := authorF.MatchString(a.Name) 163 | if err != nil { 164 | return nil, errors.Wrapf(err, "timeout on expression %s", 165 | prams.AuthorRegex) 166 | } 167 | if p { 168 | fitlerd = append(fitlerd, i) 169 | match = true 170 | break 171 | } 172 | } 173 | if match { 174 | continue 175 | } 176 | } 177 | // search content 178 | if contentF != nil { 179 | p, err := contentF.MatchString(i.Content) 180 | if err != nil { 181 | return nil, errors.Wrapf(err, "timeout on expression %s", 182 | prams.ContentRegex) 183 | } 184 | if p { 185 | fitlerd = append(fitlerd, i) 186 | continue 187 | } 188 | } 189 | 190 | // search title 191 | if linkF != nil { 192 | p, err := linkF.MatchString(i.Link) 193 | if err != nil { 194 | return nil, errors.Wrapf(err, "timeout on expression %s", 195 | prams.LinkRegex) 196 | } 197 | if p { 198 | fitlerd = append(fitlerd, i) 199 | continue 200 | } 201 | } 202 | 203 | // search title 204 | if titleF != nil { 205 | p, err := titleF.MatchString(i.Title) 206 | if err != nil { 207 | return nil, errors.Wrapf(err, "timeout on expression %s", 208 | prams.TitleRegex) 209 | } 210 | if p { 211 | fitlerd = append(fitlerd, i) 212 | continue 213 | } 214 | } 215 | // search description 216 | if descriptionF != nil { 217 | p, err := descriptionF.MatchString(i.Description) 218 | if err != nil { 219 | return nil, errors.Wrapf(err, "timeout on expression %s", 220 | prams.DescriptionRegex) 221 | } 222 | if p { 223 | fitlerd = append(fitlerd, i) 224 | } 225 | } 226 | } 227 | feeds.Items = fitlerd 228 | return feeds, nil 229 | } 230 | 231 | func validateRE2(reg string) (*regexp.Regexp, error) { 232 | if len(reg) == 0 { 233 | return nil, nil 234 | } 235 | r, err := regexp.Compile(reg) 236 | if err != nil { 237 | return nil, errors.Wrapf(err, "malformatted regex: %s", r) 238 | } 239 | return r, nil 240 | } 241 | 242 | func validateNET(reg string) (*regexp2.Regexp, error) { 243 | if len(reg) == 0 { 244 | return nil, nil 245 | } 246 | r, err := regexp2.Compile(reg, regexp2.None) 247 | if err != nil { 248 | return nil, errors.Wrapf(err, "malformatted regex: %s", r) 249 | } 250 | return r, nil 251 | } 252 | 253 | func init() { 254 | regexp2.SetTimeoutCheckPeriod(time.Second * 3) 255 | } 256 | -------------------------------------------------------------------------------- /filter/generate.go: -------------------------------------------------------------------------------- 1 | package filter 2 | 3 | import ( 4 | "fmt" 5 | "time" 6 | 7 | generator "github.com/gorilla/feeds" 8 | "github.com/mmcdole/gofeed" 9 | ) 10 | 11 | // Geerate a feed string of type t (a string should be json, rss, or atom). If t 12 | // is malformatted or invalid, it returns XML rss feeds 13 | func GenerateFeeds(feeds *gofeed.Feed, t string) (string, error) { 14 | 15 | // TODO unlike mmcdole/gofeed, does not support multiple authors. I think it 16 | // has other limitation as well, I will consider writing a better XML 17 | // generator. Or even better, considering not changing the original feeds format 18 | if feeds == nil { 19 | return "", fmt.Errorf(" no feeds provided") 20 | } 21 | 22 | author := &generator.Author{} 23 | if len(feeds.Authors) > 0 { 24 | author.Name = feeds.Authors[0].Name 25 | author.Email = feeds.Authors[0].Email 26 | } 27 | var created time.Time 28 | if feeds.PublishedParsed != nil { 29 | created = *feeds.PublishedParsed 30 | } 31 | feed := &generator.Feed{ 32 | Title: feeds.Title, 33 | Link: &generator.Link{Href: feeds.Link}, 34 | Description: feeds.Description, 35 | Author: author, 36 | Created: created, 37 | } 38 | gfeeds := []*generator.Item{} 39 | for _, i := range feeds.Items { 40 | if len(feeds.Authors) > 0 { 41 | author.Name = feeds.Authors[0].Name 42 | author.Email = feeds.Authors[0].Email 43 | } else { 44 | author = nil 45 | } 46 | gfeeds = append(gfeeds, &generator.Item{ 47 | Title: i.Title, 48 | Link: &generator.Link{Href: i.Link}, 49 | Description: i.Description, 50 | Author: author, 51 | Content: i.Content, 52 | Created: *i.PublishedParsed}) 53 | } 54 | feed.Items = gfeeds 55 | if t == "json" { 56 | return feed.ToJSON() 57 | } 58 | if t == "atom" { 59 | return feed.ToAtom() 60 | } 61 | return feed.ToRss() 62 | } 63 | -------------------------------------------------------------------------------- /fly.toml: -------------------------------------------------------------------------------- 1 | # fly.toml app configuration file generated for rssc on 2023-08-21T19:45:05+03:00 2 | # 3 | # See https://fly.io/docs/reference/configuration/ for information about how to use this file. 4 | # 5 | 6 | app = "rssc" 7 | primary_region = "ams" 8 | 9 | [build] 10 | 11 | [http_service] 12 | internal_port = 8080 13 | force_https = true 14 | auto_stop_machines = true 15 | auto_start_machines = true 16 | min_machines_running = 0 17 | processes = ["app"] 18 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/larrasket/rssc 2 | 3 | go 1.19 4 | 5 | require ( 6 | github.com/dlclark/regexp2 v1.10.0 7 | github.com/gorilla/feeds v1.1.1 8 | github.com/mmcdole/gofeed v1.2.1 9 | github.com/patrickmn/go-cache v2.1.0+incompatible 10 | github.com/pkg/errors v0.9.1 11 | ) 12 | 13 | require ( 14 | github.com/PuerkitoBio/goquery v1.8.0 // indirect 15 | github.com/andybalholm/cascadia v1.3.1 // indirect 16 | github.com/json-iterator/go v1.1.12 // indirect 17 | github.com/kr/pretty v0.3.1 // indirect 18 | github.com/mmcdole/goxpp v1.1.0 // indirect 19 | github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect 20 | github.com/modern-go/reflect2 v1.0.2 // indirect 21 | golang.org/x/net v0.17.0 // indirect 22 | golang.org/x/text v0.13.0 // indirect 23 | ) 24 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/PuerkitoBio/goquery v1.8.0 h1:PJTF7AmFCFKk1N6V6jmKfrNH9tV5pNE6lZMkG0gta/U= 2 | github.com/PuerkitoBio/goquery v1.8.0/go.mod h1:ypIiRMtY7COPGk+I/YbZLbxsxn9g5ejnI2HSMtkjZvI= 3 | github.com/andybalholm/cascadia v1.3.1 h1:nhxRkql1kdYCc8Snf7D5/D3spOX+dBgjA6u8x004T2c= 4 | github.com/andybalholm/cascadia v1.3.1/go.mod h1:R4bJ1UQfqADjvDa4P6HZHLh/3OxWWEqc0Sk8XGwHqvA= 5 | github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= 6 | github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 7 | github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= 8 | github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 9 | github.com/dlclark/regexp2 v1.10.0 h1:+/GIL799phkJqYW+3YbOd8LCcbHzT0Pbo8zl70MHsq0= 10 | github.com/dlclark/regexp2 v1.10.0/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8= 11 | github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg= 12 | github.com/gorilla/feeds v1.1.1 h1:HwKXxqzcRNg9to+BbvJog4+f3s/xzvtZXICcQGutYfY= 13 | github.com/gorilla/feeds v1.1.1/go.mod h1:Nk0jZrvPFZX1OBe5NPiddPw7CfwF6Q9eqzaBbaightA= 14 | github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM= 15 | github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo= 16 | github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE= 17 | github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk= 18 | github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY= 19 | github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE= 20 | github.com/mmcdole/gofeed v1.2.1 h1:tPbFN+mfOLcM1kDF1x2c/N68ChbdBatkppdzf/vDe1s= 21 | github.com/mmcdole/gofeed v1.2.1/go.mod h1:2wVInNpgmC85q16QTTuwbuKxtKkHLCDDtf0dCmnrNr4= 22 | github.com/mmcdole/goxpp v1.1.0 h1:WwslZNF7KNAXTFuzRtn/OKZxFLJAAyOA9w82mDz2ZGI= 23 | github.com/mmcdole/goxpp v1.1.0/go.mod h1:v+25+lT2ViuQ7mVxcncQ8ch1URund48oH+jhjiwEgS8= 24 | github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q= 25 | github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg= 26 | github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q= 27 | github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M= 28 | github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk= 29 | github.com/patrickmn/go-cache v2.1.0+incompatible h1:HRMgzkcYKYpi3C8ajMPV8OFXaaRUnok+kx1WdO15EQc= 30 | github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ= 31 | github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA= 32 | github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4= 33 | github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0= 34 | github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= 35 | github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= 36 | github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8= 37 | github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs= 38 | github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= 39 | github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI= 40 | github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk= 41 | golang.org/x/net v0.0.0-20210916014120-12bc252f5db8/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y= 42 | golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM= 43 | golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE= 44 | golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 45 | golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 46 | golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo= 47 | golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= 48 | golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k= 49 | golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE= 50 | golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= 51 | gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= 52 | -------------------------------------------------------------------------------- /rssc.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "log" 6 | "net/http" 7 | "os" 8 | "time" 9 | 10 | _ "embed" 11 | 12 | "github.com/larrasket/rssc/filter" 13 | "github.com/patrickmn/go-cache" 14 | ) 15 | 16 | //go:embed README.html 17 | var README string 18 | 19 | func main() { 20 | http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { 21 | w.Write([]byte(README)) 22 | }) 23 | 24 | c := cache.New(5*time.Second, 20*time.Second) 25 | http.HandleFunc("/rss", func(w http.ResponseWriter, r *http.Request) { 26 | q := r.URL.Query() 27 | 28 | if req, found := c.Get(q.Encode()); found { 29 | res := req.(string) 30 | w.Write([]byte(res)) 31 | return 32 | } 33 | 34 | prams := filter.FilterPrams{AuthorRegex: q.Get("authorf"), 35 | ContentRegex: q.Get("contentf"), 36 | TitleRegex: q.Get("titlef"), 37 | DescriptionRegex: q.Get("descriptionf"), 38 | LinkRegex: q.Get("linkf"), 39 | URL: q.Get("src"), 40 | DotNet: func(b string) bool { 41 | if b == "1" { 42 | return true 43 | } 44 | return false 45 | }(q.Get("net")), 46 | } 47 | 48 | entries, err := filter.FilterFeeds(&prams) 49 | if err != nil { 50 | w.Write([]byte(err.Error())) 51 | } 52 | 53 | ftype := q.Get("t") 54 | feeds, err := filter.GenerateFeeds(entries, ftype) 55 | if err != nil { 56 | w.Write([]byte(err.Error())) 57 | } 58 | 59 | if ftype == "json" { 60 | w.Header().Set("Content-Type", "application/json") 61 | } else { 62 | w.Header().Set("Content-Type", "application/xml") 63 | } 64 | 65 | c.Set(q.Encode(), feeds, cache.DefaultExpiration) 66 | w.Write([]byte(feeds)) 67 | }) 68 | 69 | port, ok := os.LookupEnv("PORT") 70 | if ok == false { 71 | port = "8080" 72 | } 73 | 74 | fmt.Printf("Listening on :%s...\n", port) 75 | log.Fatal(http.ListenAndServe(":"+port, nil)) 76 | 77 | } 78 | --------------------------------------------------------------------------------