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September 21, 2016 22:58
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Save rikonor/5e271c8c17a4930a0a4a507a6949a30e to your computer and use it in GitHub Desktop.
Expand gifv links in github comments
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// Override github CSP | |
function overrideGithubCSP() { | |
var mediaHosts = [ | |
'http://i.imgur.com', | |
'https://i.imgur.com' | |
].join(' '); | |
function overrideDetails(details) { | |
for (var i = 0; i < details.responseHeaders.length; i++) { | |
var isCSPHeader = /content-security-policy/i.test(details.responseHeaders[i].name); | |
if (isCSPHeader) { | |
var csp = details.responseHeaders[i].value; | |
csp = csp.replace('media-src', 'media-src ' + mediaHosts); | |
details.responseHeaders[i].value = csp; | |
} | |
} | |
return { responseHeaders: details.responseHeaders }; | |
} | |
var filter = { | |
urls: ['https://github.com/*'], | |
types: ["main_frame", "sub_frame"] | |
}; | |
var ctxs = ['blocking', 'responseHeaders']; | |
chrome.webRequest.onHeadersReceived.addListener(overrideDetails, filter, ctxs); | |
} | |
overrideGithubCSP(); |
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var gifvRegex = /^http.*gifv$/i; | |
function buildGifvVideoEmbed(gifvLink) { | |
var defaultVideo = "https://i.imgur.com/kMEYLEY.gifv"; | |
// validate the given link | |
if (!gifvLink.match(gifvRegex)) { | |
console.log("Not a valid gifv link, falling back to default video.."); | |
gifvLink = defaultVideo; | |
} | |
gifvLink = gifvLink.replace("gifv", "mp4"); | |
console.log("Using " + gifvLink); | |
var sourceElem = document.createElement("source"); | |
sourceElem.setAttribute("src", gifvLink); | |
sourceElem.setAttribute("type", "video/mp4"); | |
var videoElem = document.createElement("video"); | |
videoElem.appendChild(sourceElem); | |
// Set attrs | |
videoElem.setAttribute("muted", ""); | |
videoElem.setAttribute("loop", ""); | |
videoElem.setAttribute("poster", ""); | |
videoElem.className = "res-media-zoomable"; | |
videoElem.style["max-width"] = "1440px"; | |
videoElem.style["max-height"] = "320px"; | |
return videoElem; | |
} | |
function replaceGifvLinks(comments) { | |
console.log("Searching for comments in current page..") | |
var comments = document.getElementsByClassName("comment-body"); | |
if (comments.length === 0) { | |
console.log("No comments found.."); | |
return; | |
} | |
var comment = comments[0]; | |
// Search for <a> tags | |
var anchors = comment.getElementsByTagName("a"); | |
if (anchors.length === 0) { | |
console.log("No links in comment.."); | |
return; | |
} | |
var anchor = anchors[0]; | |
if (!anchor.href.match(gifvRegex)) { | |
console.log("Not a gifv link.."); | |
return | |
} | |
// Add an element after the link | |
var newVideo = buildGifvVideoEmbed(anchor.href); | |
comment.appendChild(newVideo); | |
// Start all videos | |
newVideo.play(); | |
} | |
console.log("replacing gifs"); | |
replaceGifvLinks(); |
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{ | |
"manifest_version": 2, | |
"name": "github gifv support", | |
"description": "Add gifv support to github comments", | |
"version": "1.0", | |
"browser_action": { | |
"default_title": "Expend gifv files" | |
}, | |
"permissions": [ | |
"activeTab", | |
"webRequest", | |
"webRequestBlocking", | |
"https://github.com/*" | |
], | |
"background": { | |
"scripts": ["background.js"], | |
"persistent": true | |
}, | |
"content_scripts": [ | |
{ | |
"matches": ["https://github.com/*"], | |
"js": ["gifv.js"] | |
} | |
] | |
} |
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