browser_blobFromFile.js (1526B)
1 add_task(async function test() { 2 await SpecialPowers.pushPrefEnv({ 3 set: [["browser.tabs.remote.separateFileUriProcess", true]], 4 }); 5 6 let fileData = ""; 7 for (var i = 0; i < 100; ++i) { 8 fileData += "hello world!"; 9 } 10 11 let file = Services.dirsvc.get("ProfD", Ci.nsIFile); 12 file.append("file.txt"); 13 file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600); 14 15 let outStream = Cc[ 16 "@mozilla.org/network/file-output-stream;1" 17 ].createInstance(Ci.nsIFileOutputStream); 18 outStream.init( 19 file, 20 0x02 | 0x08 | 0x20, // write, create, truncate 21 0o666, 22 0 23 ); 24 outStream.write(fileData, fileData.length); 25 outStream.close(); 26 27 let fileHandler = Services.io 28 .getProtocolHandler("file") 29 .QueryInterface(Ci.nsIFileProtocolHandler); 30 31 let fileURL = fileHandler.getURLSpecFromActualFile(file); 32 33 info("Opening url: " + fileURL); 34 let tab = BrowserTestUtils.addTab(gBrowser, fileURL); 35 36 let browser = gBrowser.getBrowserForTab(tab); 37 await BrowserTestUtils.browserLoaded(browser); 38 39 let blob = await SpecialPowers.spawn( 40 browser, 41 [file.leafName], 42 function (fileName) { 43 return new content.window.Promise(resolve => { 44 content.window 45 .fetch(fileName) 46 .then(r => r.blob()) 47 .then(blob => resolve(blob)); 48 }); 49 } 50 ); 51 52 ok(File.isInstance(blob), "We have a file"); 53 54 is(blob.size, file.fileSize, "The size matches"); 55 is(blob.name, file.leafName, "The name is correct"); 56 57 file.remove(false); 58 59 gBrowser.removeTab(tab); 60 });