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'use strict';
{
let NULL = new Uint8Array();
let xmlFeedOrImage = /^(?:(?:application|text)\/(?:(?:r(?:ss|df)|atom)\+)?xml(;|$))|image\//i;
let brokenOnLoad = (async () => parseInt(await browser.runtime.getBrowserInfo().version) < 61);
let pendingRequests = new Map();
let cleanup = r => {
pendingRequests.delete(r.requestId);
};
let filter = {
urls: ["<all_urls>"],
types: ["main_frame", "sub_frame", "object"]
};
browser.webRequest.onCompleted.addListener(cleanup, filter);
browser.webRequest.onErrorOccurred.addListener(cleanup, filter);
let executeAll = async (scripts, where) => {
let {url, tabId, frameId} = where;
for (let details of scripts.values()) {
details = Object.assign({
runAt: "document_start",
matchAboutBlank: true,
frameId,
}, details);
try {
await browser.tabs.executeScript(tabId, details);
debug("Execute on start OK", url, details);
} catch (e) {
error(e, "Execute on start failed", url, details);
}
}
};
var RequestUtil = {
getContentMetaData(request) {
if (request.content) return request.content;
let {responseHeaders} = request;
let content = request.content = {};
for (let h of responseHeaders) {
if (/^\s*Content-(Type|Disposition)\s*$/i.test(h.name)) {
content[h.name.split("-")[1].trim().toLowerCase()] = h.value;
}
}
return content;
},
async executeOnStart(request, details) {
let {requestId, tabId, frameId, statusCode} = request;
if (statusCode >= 300 && statusCode < 400) return;
let scripts = pendingRequests.get(requestId);
let scriptKey = JSON.stringify(details);
if (!scripts) {
pendingRequests.set(requestId, scripts = new Map());
scripts.set(scriptKey, details);
} else {
scripts.set(scriptKey, details);
return;
}
let content = this.getContentMetaData(request);
debug(request.url, content.type);
if (xmlFeedOrImage.test(content.type) && !/\/svg\b/i.test(content.type)) return;
let filter = browser.webRequest.filterResponseData(requestId);
let buffer = [];
let first = true;
let runAndFlush = async () => {
await executeAll(scripts, request);
if (buffer.length) {
debug("Flushing %s buffer chunks", buffer.length);
for (let chunk of buffer) {
filter.write(chunk);
}
filter.disconnect();
buffer = null;
}
};
if (brokenOnLoad) {
filter.onstart = event => {
filter.write(NULL);
}
}
filter.ondata = event => {
if (first) {
runAndFlush();
first = false;
}
if (buffer) {
buffer.push(event.data);
return;
}
filter.write(event.data);
filter.disconnect();
};
}
}
}
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