1 files changed, 258 insertions, 0 deletions
diff --git a/mailnews/mime/src/mimeParser.jsm b/mailnews/mime/src/mimeParser.jsm
new file mode 100644
index 0000000000..904675f103
--- /dev/null
+++ b/mailnews/mime/src/mimeParser.jsm
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+// vim:set ts=2 sw=2 sts=2 et ft=javascript:
+
+Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
+Components.utils.import("resource://gre/modules/Services.jsm");
+Components.utils.import("resource:///modules/jsmime.jsm");
+
+var EXPORTED_SYMBOLS = ["MimeParser"];
+
+// Emitter helpers, for internal functions later on.
+var ExtractHeadersEmitter = {
+  startPart: function (partNum, headers) {
+    if (partNum == '') {
+      this.headers = headers;
+    }
+  }
+};
+
+var ExtractHeadersAndBodyEmitter = {
+  body: '',
+  startPart: ExtractHeadersEmitter.startPart,
+  deliverPartData: function (partNum, data) {
+    if (partNum == '')
+      this.body += data;
+  }
+};
+
+var Ci = Components.interfaces;
+var Cc = Components.classes;
+
+/// Sets appropriate default options for chrome-privileged environments
+function setDefaultParserOptions(opts) {
+  if (!("onerror" in opts)) {
+    opts.onerror = Components.utils.reportError;
+  }
+}
+
+var MimeParser = {
+  /**
+   * Triggers an asynchronous parse of the given input.
+   *
+   * The input is an input stream; the stream will be read until EOF and then
+   * closed upon completion. Both blocking and nonblocking streams are
+   * supported by this implementation, but it is still guaranteed that the first
+   * callback will not happen before this method returns.
+   *
+   * @param input   An input stream of text to parse.
+   * @param emitter The emitter to receive callbacks on.
+   * @param opts    A set of options for the parser.
+   */
+  parseAsync: function MimeParser_parseAsync(input, emitter, opts) {
+    // Normalize the input into an input stream.
+    if (!(input instanceof Ci.nsIInputStream)) {
+      throw new Error("input is not a recognizable type!");
+    }
+
+    // We need a pump for the listener
+    var pump = Cc["@mozilla.org/network/input-stream-pump;1"]
+                 .createInstance(Ci.nsIInputStreamPump);
+    pump.init(input, -1, -1, 0, 0, true);
+
+    // Make a stream listener with the given emitter and use it to read from
+    // the pump.
+    var parserListener = MimeParser.makeStreamListenerParser(emitter, opts);
+    pump.asyncRead(parserListener, null);
+  },
+
+  /**
+   * Triggers an synchronous parse of the given input.
+   *
+   * The input is a string that is immediately parsed, calling all functions on
+   * the emitter before this function returns.
+   *
+   * @param input   A string or input stream of text to parse.
+   * @param emitter The emitter to receive callbacks on.
+   * @param opts    A set of options for the parser.
+   */
+  parseSync: function MimeParser_parseSync(input, emitter, opts) {
+    // We only support string parsing if we are trying to do this parse
+    // synchronously.
+    if (typeof input != "string") {
+      throw new Error("input is not a recognizable type!");
+    }
+    setDefaultParserOptions(opts);
+    var parser = new jsmime.MimeParser(emitter, opts);
+    parser.deliverData(input);
+    parser.deliverEOF();
+    return;
+  },
+
+  /**
+   * Returns a stream listener that feeds data into a parser.
+   *
+   * In addition to the functions on the emitter that the parser may use, the
+   * generated stream listener will also make calls to onStartRequest and
+   * onStopRequest on the emitter (if they exist).
+   *
+   * @param emitter The emitter to receive callbacks on.
+   * @param opts    A set of options for the parser.
+   */
+  makeStreamListenerParser: function MimeParser_makeSLParser(emitter, opts) {
+    var StreamListener = {
+      onStartRequest: function SLP_onStartRequest(aRequest, aContext) {
+        try {
+          if ("onStartRequest" in emitter)
+            emitter.onStartRequest(aRequest, aContext);
+        } finally {
+          this._parser.resetParser();
+        }
+      },
+      onStopRequest: function SLP_onStopRequest(aRequest, aContext, aStatus) {
+        this._parser.deliverEOF();
+        if ("onStopRequest" in emitter)
+          emitter.onStopRequest(aRequest, aContext, aStatus);
+      },
+      onDataAvailable: function SLP_onData(aRequest, aContext, aStream,
+                                           aOffset, aCount) {
+        var scriptIn = Cc["@mozilla.org/scriptableinputstream;1"]
+                         .createInstance(Ci.nsIScriptableInputStream);
+        scriptIn.init(aStream);
+        // Use readBytes instead of read to handle embedded NULs properly.
+        this._parser.deliverData(scriptIn.readBytes(aCount));
+      },
+      QueryInterface: XPCOMUtils.generateQI([Ci.nsIStreamListener,
+        Ci.nsIRequestObserver])
+    };
+    setDefaultParserOptions(opts);
+    StreamListener._parser = new jsmime.MimeParser(emitter, opts);
+    return StreamListener;
+  },
+
+  /**
+   * Returns a new raw MIME parser.
+   *
+   * Prefer one of the other methods where possible, since the input here must
+   * be driven manually.
+   *
+   * @param emitter The emitter to receive callbacks on.
+   * @param opts    A set of options for the parser.
+   */
+  makeParser: function MimeParser_makeParser(emitter, opts) {
+    setDefaultParserOptions(opts);
+    return new jsmime.MimeParser(emitter, opts);
+  },
+
+  /**
+   * Returns a dictionary of headers for the given input.
+   *
+   * The input is any type of input that would be accepted by parseSync. What
+   * is returned is a JS object that represents the headers of the entire
+   * envelope as would be received by startPart when partNum is the empty
+   * string.
+   *
+   * @param input   A string of text to parse.
+   */
+  extractHeaders: function MimeParser_extractHeaders(input) {
+    var emitter = Object.create(ExtractHeadersEmitter);
+    MimeParser.parseSync(input, emitter, {pruneat: '', bodyformat: 'none'});
+    return emitter.headers;
+  },
+
+  /**
+   * Returns the headers and body for the given input message.
+   *
+   * The return value is an array whose first element is the dictionary of
+   * headers (as would be returned by extractHeaders) and whose second element
+   * is a binary string of the entire body of the message.
+   *
+   * @param input   A string of text to parse.
+   */
+  extractHeadersAndBody: function MimeParser_extractHeaders(input) {
+    var emitter = Object.create(ExtractHeadersAndBodyEmitter);
+    MimeParser.parseSync(input, emitter, {pruneat: '', bodyformat: 'raw'});
+    return [emitter.headers, emitter.body];
+  },
+
+  // Parameters for parseHeaderField
+
+  /**
+   * Parse the header as if it were unstructured.
+   *
+   * This results in the same string if no other options are specified. If other
+   * options are specified, this causes the string to be modified appropriately.
+   */
+  HEADER_UNSTRUCTURED:       0x00,
+  /**
+   * Parse the header as if it were in the form text; attr=val; attr=val.
+   *
+   * Such headers include Content-Type, Content-Disposition, and most other
+   * headers used by MIME as opposed to messages.
+   */
+  HEADER_PARAMETER:          0x02,
+  /**
+   * Parse the header as if it were a sequence of mailboxes.
+   */
+  HEADER_ADDRESS:            0x03,
+
+  /**
+   * This decodes parameter values according to RFC 2231.
+   *
+   * This flag means nothing if HEADER_PARAMETER is not specified.
+   */
+  HEADER_OPTION_DECODE_2231: 0x10,
+  /**
+   * This decodes the inline encoded-words that are in RFC 2047.
+   */
+  HEADER_OPTION_DECODE_2047: 0x20,
+  /**
+   * This converts the header from a raw string to proper Unicode.
+   */
+  HEADER_OPTION_ALLOW_RAW:   0x40,
+
+  /// Convenience for all three of the above.
+  HEADER_OPTION_ALL_I18N:    0x70,
+
+  /**
+   * Parse a header field according to the specification given by flags.
+   *
+   * Permissible flags begin with one of the HEADER_* flags, which may be or'd
+   * with any of the HEADER_OPTION_* flags to modify the result appropriately.
+   *
+   * If the option HEADER_OPTION_ALLOW_RAW is passed, the charset parameter, if
+   * present, is the charset to fallback to if the header is not decodable as
+   * UTF-8 text. If HEADER_OPTION_ALLOW_RAW is passed but the charset parameter
+   * is not provided, then no fallback decoding will be done. If
+   * HEADER_OPTION_ALLOW_RAW is not passed, then no attempt will be made to
+   * convert charsets.
+   *
+   * @param text    The value of a MIME or message header to parse.
+   * @param flags   A set of flags that controls interpretation of the header.
+   * @param charset A default charset to assume if no information may be found.
+   */
+  parseHeaderField: function MimeParser_parseHeaderField(text, flags, charset) {
+    // If we have a raw string, convert it to Unicode first
+    if (flags & MimeParser.HEADER_OPTION_ALLOW_RAW)
+      text = jsmime.headerparser.convert8BitHeader(text, charset);
+
+    // The low 4 bits indicate the type of the header we are parsing. All of the
+    // higher-order bits are flags.
+    switch (flags & 0x0f) {
+    case MimeParser.HEADER_UNSTRUCTURED:
+      if (flags & MimeParser.HEADER_OPTION_DECODE_2047)
+        text = jsmime.headerparser.decodeRFC2047Words(text);
+      return text;
+    case MimeParser.HEADER_PARAMETER:
+      return jsmime.headerparser.parseParameterHeader(text,
+        (flags & MimeParser.HEADER_OPTION_DECODE_2047) != 0,
+        (flags & MimeParser.HEADER_OPTION_DECODE_2231) != 0);
+    case MimeParser.HEADER_ADDRESS:
+      return jsmime.headerparser.parseAddressingHeader(text,
+        (flags & MimeParser.HEADER_OPTION_DECODE_2047) != 0);
+    default:
+      throw "Illegal type of header field";
+    }
+  },
+};