get api libs from bower

dashboard-ui/bower_components/hls.js/src/crypt/decrypter.js

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+/*
+ * AES128 decryption.
+ */
+
+import AES128Decrypter from './aes128-decrypter';
+import {ErrorTypes, ErrorDetails} from '../errors';
+import {logger} from '../utils/logger';
+
+class Decrypter {
+
+  constructor(hls) {
+    this.hls = hls;
+    try {
+      const browserCrypto = window ? window.crypto : crypto;
+      this.subtle = browserCrypto.subtle || browserCrypto.webkitSubtle;
+      this.disableWebCrypto = !this.subtle;
+    } catch (e) {
+      this.disableWebCrypto = true;
+    }
+  }
+
+  destroy() {
+  }
+
+  decrypt(data, key, iv, callback) {
+    if (this.disableWebCrypto && this.hls.config.enableSoftwareAES) {
+      this.decryptBySoftware(data, key, iv, callback);
+    } else {
+      this.decryptByWebCrypto(data, key, iv, callback);
+    }
+  }
+
+  decryptByWebCrypto(data, key, iv, callback) {
+    logger.log('decrypting by WebCrypto API');
+
+    this.subtle.importKey('raw', key, { name : 'AES-CBC', length : 128 }, false, ['decrypt']).
+      then((importedKey) => {
+        this.subtle.decrypt({ name : 'AES-CBC', iv : iv.buffer }, importedKey, data).
+          then(callback).
+          catch ((err) => {
+            this.onWebCryptoError(err, data, key, iv, callback);
+          });
+      }).
+    catch ((err) => {
+      this.onWebCryptoError(err, data, key, iv, callback);
+    });
+  }
+
+  decryptBySoftware(data, key8, iv8, callback) {
+    logger.log('decrypting by JavaScript Implementation');
+
+    var view = new DataView(key8.buffer);
+    var key = new Uint32Array([
+        view.getUint32(0),
+        view.getUint32(4),
+        view.getUint32(8),
+        view.getUint32(12)
+    ]);
+
+    view = new DataView(iv8.buffer);
+    var iv = new Uint32Array([
+        view.getUint32(0),
+        view.getUint32(4),
+        view.getUint32(8),
+        view.getUint32(12)
+    ]);
+
+    var decrypter = new AES128Decrypter(key, iv);
+    callback(decrypter.decrypt(data).buffer);
+  }
+
+  onWebCryptoError(err, data, key, iv, callback) {
+    if (this.hls.config.enableSoftwareAES) {
+      logger.log('disabling to use WebCrypto API');
+      this.disableWebCrypto = true;
+      this.decryptBySoftware(data, key, iv, callback);
+    }
+    else {
+      logger.error(`decrypting error : ${err.message}`);
+      this.hls.trigger(Event.ERROR, {type : ErrorTypes.MEDIA_ERROR, details : ErrorDetails.FRAG_DECRYPT_ERROR, fatal : true, reason : err.message});
+    }
+  }
+
+}
+
+export default Decrypter;