├── .gitignore ├── static ├── pinner │ ├── favicon.ico │ ├── index.js │ └── index.html └── nginx.conf ├── test.sh ├── docker-compose.yml ├── tests └── test_start.py ├── pyproject.toml ├── Dockerfile ├── .github └── workflows │ └── main.yml ├── README.md ├── src └── ipfs_video_gateway │ └── start.py ├── poetry.lock └── LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | playbook.retry 2 | .vscode 3 | dist 4 | __pycache__ -------------------------------------------------------------------------------- /static/pinner/favicon.ico: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/bneijt/ipfs-video-gateway/HEAD/static/pinner/favicon.ico -------------------------------------------------------------------------------- /test.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | ./build.sh 3 | docker run --publish 4000:80 --volume /tmp/ipfs:/ipfs --rm -it ipfs-video-gateway -------------------------------------------------------------------------------- /docker-compose.yml: -------------------------------------------------------------------------------- 1 | version: "3.3" 2 | services: 3 | gateway: 4 | image: bneijt/ipfs-video-gateway 5 | ports: 6 | - "80:80" 7 | volumes: 8 | - /opt/ipfs:/ipfs 9 | deploy: 10 | restart_policy: 11 | condition: any 12 | -------------------------------------------------------------------------------- /tests/test_start.py: -------------------------------------------------------------------------------- 1 | 2 | from ipfs_video_gateway.start import is_stable, FOLDER_STATUS_CACHE 3 | 4 | def test_is_stable(): 5 | assert is_stable("src") == False, "First time should be unstable" 6 | assert is_stable("src") == True, "Second time we see nothing changed" 7 | is_stable("src", forget=True) 8 | assert "src" not in FOLDER_STATUS_CACHE -------------------------------------------------------------------------------- /pyproject.toml: -------------------------------------------------------------------------------- 1 | [tool.poetry] 2 | name = "ipfs-video-gateway" 3 | version = "1.0.0" 4 | description = "Docker based IPFS pinning front-end" 5 | authors = ["Bram Neijt "] 6 | packages = [{ include = "ipfs_video_gateway", from = "src" }] 7 | 8 | [tool.poetry.dependencies] 9 | python = "^3.8" 10 | 11 | [tool.poetry.dev-dependencies] 12 | pytest = "^6.2.5" 13 | black = "^21.10b0" 14 | poetry-lock-package = "^0.4.3" 15 | 16 | [build-system] 17 | requires = ["poetry-core>=1.0.0"] 18 | build-backend = "poetry.core.masonry.api" 19 | -------------------------------------------------------------------------------- /static/pinner/index.js: -------------------------------------------------------------------------------- 1 | var app = new Vue({ 2 | el: '#app', 3 | data() { 4 | return { 5 | pinned: [ 6 | ], 7 | cidToPin: '', 8 | lastPinResponse: '' 9 | }; 10 | }, 11 | methods: { 12 | pinReload: function () { 13 | this.lastPinResponse = 'Reloading...'; 14 | axios 15 | .get('/api/v0/pin/ls', { 16 | params: { 17 | type: 'recursive' 18 | } 19 | }) 20 | .then(response => { this.lastPinResponse = response.statusText; this.pinned = response.data }) 21 | .catch(error => (this.lastPinResponse = error.response.statusText)); 22 | } 23 | }, 24 | mounted() { 25 | this.pinReload(); 26 | } 27 | }) 28 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM archlinux 2 | 3 | RUN set -e; \ 4 | pacman --noconfirm -Sy; \ 5 | pacman --noconfirm -S archlinux-keyring; \ 6 | pacman --noconfirm -Su; \ 7 | pacman-db-upgrade; \ 8 | trust extract-compat; \ 9 | pacman --noconfirm -S go-ipfs python python-pip nginx; \ 10 | useradd -G daemon -s /bin/nologin -d /ipfs ipfs; 11 | 12 | WORKDIR /ipfs 13 | 14 | ADD static/nginx.conf /etc/nginx/nginx.conf 15 | ADD static/pinner /srv/http/pinner 16 | 17 | # Copy and install base requirements 18 | COPY dist/*_lock*.whl / 19 | RUN pip install --no-cache-dir /*.whl \ 20 | && rm /*.whl 21 | 22 | # Copy and install package 23 | COPY dist/*.whl / 24 | RUN pip install --no-cache-dir /*.whl \ 25 | && rm /*.whl 26 | 27 | VOLUME /ipfs 28 | 29 | EXPOSE 80 30 | 31 | CMD ["/usr/sbin/python", "-m", "ipfs_video_gateway.start"] 32 | -------------------------------------------------------------------------------- /.github/workflows/main.yml: -------------------------------------------------------------------------------- 1 | name: main 2 | 3 | on: 4 | push: 5 | branches: [main] 6 | tags: ["*"] 7 | pull_request: 8 | branches: [main] 9 | 10 | jobs: 11 | publish: 12 | runs-on: ubuntu-latest 13 | steps: 14 | - uses: actions/checkout@v2 15 | - uses: actions/setup-python@v2 16 | with: 17 | python-version: 3.8 18 | - run: pip install poetry==1.1.7 19 | - run: poetry install 20 | - run: poetry run pytest tests 21 | - run: poetry build 22 | - run: poetry run poetry-lock-package --build --no-root 23 | 24 | - name: Log in to Docker Hub 25 | uses: docker/login-action@v1 26 | with: 27 | username: ${{ secrets.DOCKER_USERNAME }} 28 | password: ${{ secrets.DOCKER_PASSWORD }} 29 | 30 | - name: Extract metadata (tags, labels) for Docker 31 | id: meta 32 | uses: docker/metadata-action@v3 33 | with: 34 | images: bneijt/ipfs-video-gateway 35 | 36 | - name: Build and push Docker image 37 | uses: docker/build-push-action@v2 38 | with: 39 | context: . 40 | push: ${{ github.event_name != 'pull_request' }} 41 | tags: ${{ steps.meta.outputs.tags }} 42 | labels: ${{ steps.meta.outputs.labels }} 43 | -------------------------------------------------------------------------------- /static/nginx.conf: -------------------------------------------------------------------------------- 1 | user daemon; 2 | daemon off; 3 | worker_processes auto; 4 | pid /run/nginx.pid; 5 | 6 | events { 7 | worker_connections 768; 8 | } 9 | 10 | http { 11 | sendfile on; 12 | tcp_nopush on; 13 | tcp_nodelay on; 14 | keepalive_timeout 65; 15 | types_hash_max_size 2048; 16 | server_tokens off; 17 | 18 | include /etc/nginx/mime.types; 19 | default_type application/octet-stream; 20 | 21 | access_log off; 22 | error_log off; 23 | 24 | proxy_set_header Referer ""; 25 | proxy_set_header User-Agent ""; 26 | 27 | server { 28 | listen 80; 29 | listen [::]:80; 30 | 31 | location / { 32 | root /srv/http/pinner; 33 | index index.html; 34 | add_header Cache-Control "max-age=2629743"; 35 | } 36 | location /ipfs { 37 | if ($request_method != GET) { 38 | return 403; 39 | } 40 | proxy_bind 127.0.0.1; 41 | proxy_pass http://127.0.0.1:8080/ipfs; 42 | add_header X-Robots-Tag "noindex, nofollow"; 43 | add_header Cache-Control "max-age=2629743"; 44 | } 45 | location /api/v0/pin/ls { 46 | if ($request_method != GET) { 47 | return 403; 48 | } 49 | proxy_bind 127.0.0.1; 50 | proxy_method POST; 51 | proxy_pass http://127.0.0.1:5001/api/v0/pin/ls; 52 | add_header Cache-Control "max-age=2629743"; 53 | } 54 | } 55 | } 56 | -------------------------------------------------------------------------------- /static/pinner/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | IPFS video pinner 8 | 9 | 10 | 11 | 56 | 57 | 58 | 59 |
60 |
61 |
62 |

63 | IPFS gateway and pinner 64 |

65 |
66 |
67 |
68 |
69 | 70 |

Pinned items

71 |
    72 |
  1. 73 | {{ cid }} 74 |
    2. 75 |
76 |
77 |

78 | 

79 |         {{ lastPinResponse }}
80 |
81 |

82 |
83 | 84 |
85 | 86 | 87 | 88 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | Easily host files on IPFS 2 | ========================= 3 | 4 | A docker container containing an HTTP gateway and IPFS node to easily host files on IPFS. 5 | 6 | You run the docker container with a shared volume for the ipfs storage. If you add files 7 | to the volume, they are added to ipfs, pinned and deleted. 8 | 9 | Installation 10 | ============ 11 | 12 | The software is packages as a docker container. Pick any of the following options to start the docker container. 13 | 14 | Locally 15 | ------- 16 | 17 | Test run with `docker run --volume /srv/ipfs:/ipfs --publish 4000:80 bneijt/ipfs-video-gateway` 18 | and visit [localhost:4000](http://localhost:4000) to view the front-end. 19 | 20 | If you like it, use daemonize and restart to make it more permanent: 21 | 22 | docker run --volume /srv/ipfs:/ipfs --publish 4000:80 -d --restart=always bneijt/ipfs-video-gateway 23 | 24 | Using cloud-init to provision on server creation 25 | ------------------------------------------------ 26 | 27 | You can use [cloud-init to configure a Scaleway server](https://www.scaleway.com/docs/how-to-use-cloud-init-to-configure-your-server-at-first-boot/) and have everything automatically done. 28 | 29 | Copy paste the following cloud-init in the *Configure advanced options* section of the Scaleway new server form: 30 | 31 | #cloud-config 32 | packages: 33 | - docker.io 34 | runcmd: 35 | - "docker run --volume /srv/ipfs:/ipfs --publish 80:80 -d --restart=always bneijt/ipfs-video-gateway" 36 | 37 | After starting the server, wait for a few minutes for the system to update, install and configure. 38 | 39 | Usage 40 | ===== 41 | 42 | The docker container will check to see if there are files in `/ipfs` every 10 seconds or so. If there is a directory of file, and none of the files are hidden or end with `.part` it will add the files to IPFS and delete the folder. 43 | 44 | If you have provisioned a server using cloud-init, you can rsync files to it using: 45 | 46 | rsync --progress -r folder_to_add root@ip_of_server:/srv/ipfs/ 47 | 48 | of if you are running the files locally, use `rsync --progress -r folder_to_add /srv/ipfs/`. **Remember: files in /srv/ipfs will be deleted after adding them to the ipfs index**. 49 | 50 | If you have not used `--volume` when starting docker, you can upload the files into the container using [docker cp](https://docs.docker.com/engine/reference/commandline/cp/) 51 | 52 | docker ps # to find out the container id 53 | docker cp directory container_id:/ipfs 54 | 55 | 56 | Development 57 | =========== 58 | 59 | Update files in `src`, test using [`test.sh`](test.sh) 60 | -------------------------------------------------------------------------------- /src/ipfs_video_gateway/start.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python3 2 | import logging 3 | import sys 4 | import os 5 | import subprocess 6 | from typing import Callable, Optional, List 7 | import shutil 8 | 9 | IPFS_HOME = "/ipfs" 10 | FOLDER_STATUS_CACHE = {} 11 | 12 | logging.basicConfig( 13 | level=logging.DEBUG, 14 | format="%(asctime)s %(levelname)s %(message)s", 15 | datefmt="%Y-%m-%d %H:%M", 16 | ) 17 | logger = logging.getLogger(__name__) 18 | logger.setLevel(logging.INFO) 19 | logger.info("START") 20 | 21 | 22 | def checked_run(proc: subprocess.Popen): 23 | proc.wait() 24 | if proc.returncode != 0: 25 | raise Exception(f"Failure trying to execute: {str(proc.args)}") 26 | return proc 27 | 28 | 29 | def init_ipfs() -> Optional[subprocess.Popen]: 30 | if not os.path.exists(os.path.join(IPFS_HOME, ".ipfs")): 31 | logger.info("Initializing ipfs") 32 | init_commands = [ 33 | "ipfs init --empty-repo --profile flatfs,server", 34 | "ipfs config Addresses.API /ip4/0.0.0.0/tcp/5001", 35 | "ipfs config Addresses.Gateway /ip4/0.0.0.0/tcp/8080", 36 | ] 37 | 38 | for ic in init_commands: 39 | checked_run(as_ipfs(ic)) 40 | return None 41 | 42 | 43 | def start_ipfs() -> subprocess.Popen: 44 | return as_ipfs("ipfs daemon --enable-gc") 45 | 46 | 47 | def as_ipfs(cmd: str) -> subprocess.Popen: 48 | return subprocess.Popen(["su", "-s", "/bin/bash", "-g", "ipfs", "-c", cmd, "ipfs"]) 49 | 50 | 51 | def start_nginx() -> subprocess.Popen: 52 | return subprocess.Popen(["nginx"]) 53 | 54 | 55 | def wait_for_either(processList: List[subprocess.Popen], in_between: Callable): 56 | while True: 57 | for p in processList: 58 | try: 59 | return p.wait(10) 60 | except subprocess.TimeoutExpired: 61 | pass 62 | in_between() 63 | 64 | 65 | def is_hidden_or_part_file(file_name: str) -> bool: 66 | return file_name.startswith(".") or file_name.endswith(".part") 67 | 68 | 69 | def contains_files(path: str, matcher: Callable[[str], bool]) -> bool: 70 | if os.path.isdir(path): 71 | for root, dirs, files in os.walk(path): 72 | if any(map(matcher, dirs + files)): 73 | return True 74 | return matcher(os.path.basename(path)) 75 | 76 | 77 | def ipfs_add(file_path: str): 78 | logger.info(f"Adding '{file_path}'") 79 | sys.stdout.flush() 80 | checked_run( 81 | as_ipfs( 82 | f"ipfs add --recursive --wrap-with-directory --silent --pin '{file_path}'" 83 | ) 84 | ) 85 | 86 | 87 | def is_stable(path: str, forget: bool = False) -> bool: 88 | global FOLDER_STATUS_CACHE 89 | if forget: 90 | if path in FOLDER_STATUS_CACHE: 91 | del FOLDER_STATUS_CACHE[path] 92 | return 93 | current_status = "#".join( 94 | [ 95 | "#".join( 96 | [ 97 | f"{name}={os.path.getsize(os.path.join(root, name))}" 98 | for name in sorted(files) 99 | ] 100 | ) 101 | for root, _, files in os.walk(path) 102 | ] 103 | ) 104 | old_state = FOLDER_STATUS_CACHE.get(path) 105 | FOLDER_STATUS_CACHE[path] = current_status 106 | return old_state is not None and old_state == current_status 107 | 108 | 109 | def check_for_new_files() -> None: 110 | for name in os.listdir(IPFS_HOME): 111 | if name.startswith(".") or name.endswith(".part"): 112 | continue 113 | file_path = os.path.join(IPFS_HOME, name) 114 | 115 | if os.path.isdir(file_path): 116 | if not contains_files(name, is_hidden_or_part_file): 117 | if is_stable(file_path): 118 | ipfs_add(file_path) 119 | shutil.rmtree(file_path) 120 | is_stable(file_path, forget=True) 121 | else: 122 | logger.info( 123 | f"Ignoring '{file_path}' because it has changing content" 124 | ) 125 | 126 | else: 127 | logger.info( 128 | f"Ignoring '{file_path}' because it contains hidden or partial files" 129 | ) 130 | sys.stdout.flush() 131 | continue 132 | 133 | else: 134 | if not is_hidden_or_part_file(file_path): 135 | ipfs_add(file_path) 136 | os.unlink(file_path) 137 | else: 138 | logger.info( 139 | f"Ignoring '{file_path}' because it contains hidden or partial files" 140 | ) 141 | sys.stdout.flush() 142 | continue 143 | 144 | 145 | def main(): 146 | enable_nginx = "DISABLE_NGINX" not in os.environ 147 | 148 | checked_run(subprocess.Popen(["chown", "ipfs", IPFS_HOME])) 149 | checked_run(subprocess.Popen(["chmod", "u+rwx,g+rwx", IPFS_HOME])) 150 | 151 | init_ipfs() 152 | subprocess_list = [] # type: List[subprocess.Popen] 153 | 154 | if enable_nginx: 155 | subprocess_list.append(start_nginx()) 156 | 157 | subprocess_list.append(start_ipfs()) 158 | wait_for_either(subprocess_list, check_for_new_files) 159 | for sp in subprocess_list: 160 | sp.terminate() 161 | return 0 162 | 163 | 164 | if __name__ == "__main__": 165 | sys.exit(main()) 166 | -------------------------------------------------------------------------------- /poetry.lock: -------------------------------------------------------------------------------- 1 | [[package]] 2 | name = "atomicwrites" 3 | version = "1.4.0" 4 | description = "Atomic file writes." 5 | category = "dev" 6 | optional = false 7 | python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*" 8 | 9 | [[package]] 10 | name = "attrs" 11 | version = "21.2.0" 12 | description = "Classes Without Boilerplate" 13 | category = "dev" 14 | optional = false 15 | python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*" 16 | 17 | [package.extras] 18 | dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit"] 19 | docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"] 20 | tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface"] 21 | tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins"] 22 | 23 | [[package]] 24 | name = "black" 25 | version = "21.10b0" 26 | description = "The uncompromising code formatter." 27 | category = "dev" 28 | optional = false 29 | python-versions = ">=3.6.2" 30 | 31 | [package.dependencies] 32 | click = ">=7.1.2" 33 | mypy-extensions = ">=0.4.3" 34 | pathspec = ">=0.9.0,<1" 35 | platformdirs = ">=2" 36 | regex = ">=2020.1.8" 37 | tomli = ">=0.2.6,<2.0.0" 38 | typing-extensions = [ 39 | {version = ">=3.10.0.0", markers = "python_version < \"3.10\""}, 40 | {version = "!=3.10.0.1", markers = "python_version >= \"3.10\""}, 41 | ] 42 | 43 | [package.extras] 44 | colorama = ["colorama (>=0.4.3)"] 45 | d = ["aiohttp (>=3.7.4)"] 46 | jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"] 47 | python2 = ["typed-ast (>=1.4.3)"] 48 | uvloop = ["uvloop (>=0.15.2)"] 49 | 50 | [[package]] 51 | name = "click" 52 | version = "8.0.3" 53 | description = "Composable command line interface toolkit" 54 | category = "dev" 55 | optional = false 56 | python-versions = ">=3.6" 57 | 58 | [package.dependencies] 59 | colorama = {version = "*", markers = "platform_system == \"Windows\""} 60 | 61 | [[package]] 62 | name = "colorama" 63 | version = "0.4.4" 64 | description = "Cross-platform colored terminal text." 65 | category = "dev" 66 | optional = false 67 | python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*" 68 | 69 | [[package]] 70 | name = "iniconfig" 71 | version = "1.1.1" 72 | description = "iniconfig: brain-dead simple config-ini parsing" 73 | category = "dev" 74 | optional = false 75 | python-versions = "*" 76 | 77 | [[package]] 78 | name = "mypy-extensions" 79 | version = "0.4.3" 80 | description = "Experimental type system extensions for programs checked with the mypy typechecker." 81 | category = "dev" 82 | optional = false 83 | python-versions = "*" 84 | 85 | [[package]] 86 | name = "packaging" 87 | version = "21.2" 88 | description = "Core utilities for Python packages" 89 | category = "dev" 90 | optional = false 91 | python-versions = ">=3.6" 92 | 93 | [package.dependencies] 94 | pyparsing = ">=2.0.2,<3" 95 | 96 | [[package]] 97 | name = 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[package.extras] 125 | dev = ["pre-commit", "tox"] 126 | testing = ["pytest", "pytest-benchmark"] 127 | 128 | [[package]] 129 | name = "poetry-lock-package" 130 | version = "0.4.3" 131 | description = "Poetry lock package generator" 132 | category = "dev" 133 | optional = false 134 | python-versions = ">=3.6.2,<4.0.0" 135 | 136 | [package.dependencies] 137 | toml = ">=0.10.1,<0.11.0" 138 | 139 | [[package]] 140 | name = "py" 141 | version = "1.11.0" 142 | description = "library with cross-python path, ini-parsing, io, code, log facilities" 143 | category = "dev" 144 | optional = false 145 | python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*" 146 | 147 | [[package]] 148 | name = "pyparsing" 149 | version = "2.4.7" 150 | description = "Python parsing module" 151 | category = "dev" 152 | optional = false 153 | python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*" 154 | 155 | [[package]] 156 | name = "pytest" 157 | version = "6.2.5" 158 | description = "pytest: simple 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Patents. 472 | 473 | A "contributor" is a copyright holder who authorizes use under this 474 | License of the Program or a work on which the Program is based. The 475 | work thus licensed is called the contributor's "contributor version". 476 | 477 | A contributor's "essential patent claims" are all patent claims 478 | owned or controlled by the contributor, whether already acquired or 479 | hereafter acquired, that would be infringed by some manner, permitted 480 | by this License, of making, using, or selling its contributor version, 481 | but do not include claims that would be infringed only as a 482 | consequence of further modification of the contributor version. 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You may not convey a covered 525 | work if you are a party to an arrangement with a third party that is 526 | in the business of distributing software, under which you make payment 527 | to the third party based on the extent of your activity of conveying 528 | the work, and under which the third party grants, to any of the 529 | parties who would receive the covered work from you, a discriminatory 530 | patent license (a) in connection with copies of the covered work 531 | conveyed by you (or copies made from those copies), or (b) primarily 532 | for and in connection with specific products or compilations that 533 | contain the covered work, unless you entered into that arrangement, 534 | or that patent license was granted, prior to 28 March 2007. 535 | 536 | Nothing in this License shall be construed as excluding or limiting 537 | any implied license or other defenses to infringement that may 538 | otherwise be available to you under applicable patent law. 539 | 540 | 12. No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. 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 | --------------------------------------------------------------------------------