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208 lines
9.6 KiB
Plaintext
208 lines
9.6 KiB
Plaintext
/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim:expandtab:shiftwidth=4:tabstop=4:
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* This interface allows any module to access the routine
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* for MIME header parameter parsing (RFC 2231/5987)
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*/
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#include "nsISupports.idl"
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[scriptable, uuid(9c9252a1-fdaf-40a2-9c2b-a3dc45e28dde)]
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interface nsIMIMEHeaderParam : nsISupports {
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/**
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* Given the value of a single header field (such as
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* Content-Disposition and Content-Type) and the name of a parameter
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* (e.g. filename, name, charset), returns the value of the parameter.
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* The value is obtained by decoding RFC 2231/5987-style encoding,
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* RFC 2047-style encoding, and converting to UniChar(UTF-16)
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* from charset specified in RFC 2231/2047 encoding, UTF-8,
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* <code>aFallbackCharset</code>, the locale charset as fallback if
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* <code>TryLocaleCharset</code> is set, and null-padding as last resort
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* if all else fails.
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*
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* <p>
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* This method internally invokes <code>getParameterInternal</code>,
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* However, it does not stop at decoding RFC 2231 (the task for
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* <code>getParameterInternal</code> but tries to cope
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* with several non-standard-compliant cases mentioned below.
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*
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* <p>
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* Note that a lot of MUAs put RFC 2047-encoded parameters. Unfortunately,
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* this includes Mozilla as of 2003-05-30. Even more standard-ignorant MUAs,
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* web servers and application servers put 'raw 8bit characters'. This will
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* try to cope with all these cases as gracefully as possible. Additionally,
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* it returns the language tag if the parameter is encoded per RFC 2231 and
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* includes lang.
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*
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* <p>
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* Note that GetParameterHTTP skips some of the workarounds used for
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* mail (MIME) header fields, and thus SHOULD be used from non-mail
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* code.
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*
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*
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* @param aHeaderVal a header string to get the value of a parameter
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* from.
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* @param aParamName the name of a MIME header parameter (e.g.
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* filename, name, charset). If empty, returns
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* the first (possibly) _unnamed_ 'parameter'.
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* @param aFallbackCharset fallback charset to try if the string after
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* RFC 2231/2047 decoding or the raw 8bit
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* string is not UTF-8
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* @param aTryLocaleCharset If set, makes yet another attempt
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* with the locale charset.
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* @param aLang If non-null, assigns it to a pointer
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* to a string containing the value of language
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* obtained from RFC 2231 parsing. Caller has to
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* nsMemory::Free it.
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* @return the value of <code>aParamName</code> in Unichar(UTF-16).
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*/
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AString getParameter(in ACString aHeaderVal,
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in string aParamName,
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in ACString aFallbackCharset,
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in boolean aTryLocaleCharset,
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out string aLang);
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/**
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* Like getParameter, but disabling encodings and workarounds specific to
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* MIME (as opposed to HTTP).
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*/
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AString getParameterHTTP(in ACString aHeaderVal,
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in string aParamName,
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in ACString aFallbackCharset,
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in boolean aTryLocaleCharset,
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out string aLang);
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/**
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* Given the value of a header field parameter using the encoding
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* defined in RFC 5987, decode the value into a Unicode string, and extract
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* the optional language parameter.
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*
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* <p>
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* This function is purposefully picky; it will abort for all (most?)
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* invalid inputs. This is by design. In particular, it does not support
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* any character encodings other than UTF-8, in order not to promote
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* non-interoperable usage.
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*
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* <p>
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* Code that parses HTTP header fields (as opposed to MIME header fields)
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* should use this function.
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*
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* @param aParamVal a header field parameter to decode.
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* @param aLang will be set to the language part (possibly
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* empty).
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* @return the decoded parameter value.
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*/
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AString decodeRFC5987Param(in ACString aParamVal,
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out ACString aLang);
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/**
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* Given the value of a single header field (such as
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* Content-Disposition and Content-Type) and the name of a parameter
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* (e.g. filename, name, charset), returns the value of the parameter
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* after decoding RFC 2231-style encoding.
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* <p>
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* For <strong>internal use only</strong>. The only other place where
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* this needs to be invoked is |MimeHeaders_get_parameter| in
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* mailnews/mime/src/mimehdrs.cpp defined as
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* char * MimeHeaders_get_parameter (const char *header_value,
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* const char *parm_name,
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* char **charset, char **language)
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*
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* Otherwise, this method would have been made static.
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*
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* @param aHeaderVal a header string to get the value of a parameter from.
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* @param aParamName the name of a MIME header parameter (e.g.
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* filename, name, charset). If empty, returns
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* the first (possibly) _unnamed_ 'parameter'.
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* @param aCharset If non-null, it gets assigned a new pointer
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* to a string containing the value of charset obtained
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* from RFC 2231 parsing. Caller has to nsMemory::Free it.
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* @param aLang If non-null, it gets assigned a new pointer
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* to a string containing the value of language obtained
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* from RFC 2231 parsing. Caller has to nsMemory::Free it.
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* @return the value of <code>aParamName</code> after
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* RFC 2231 decoding but without charset conversion.
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*/
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[noscript]
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string getParameterInternal(in string aHeaderVal,
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in string aParamName,
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out string aCharset,
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out string aLang);
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/**
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* Given a header value, decodes RFC 2047-style encoding and
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* returns the decoded header value in UTF-8 if either it's
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* RFC-2047-encoded or aDefaultCharset is given. Otherwise,
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* returns the input header value (in whatever encoding)
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* as it is except that RFC 822 (using backslash) quotation and
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* CRLF (if aEatContinuation is set) are stripped away
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* <p>
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* For internal use only. The only other place where this needs to be
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* invoked is <code>MIME_DecodeMimeHeader</code> in
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* mailnews/mime/src/mimehdrs.cpp defined as
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* char * Mime_DecodeMimeHeader(char *header_val, const char *charset,
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* bool override, bool eatcontinuation)
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*
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* @param aHeaderVal a header value to decode
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* @param aDefaultCharset MIME charset to use in place of MIME charset
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* specified in RFC 2047 style encoding
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* when <code>aOverrideCharset</code> is set.
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* @param aOverrideCharset When set, overrides MIME charset specified
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* in RFC 2047 style encoding with <code>aDefaultCharset</code>
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* @param aEatContinuation When set, removes CR/LF
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* @return decoded header value
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*/
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[noscript]
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ACString decodeRFC2047Header(in string aHeaderVal,
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in string aDefaultCharset,
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in boolean aOverrideCharset,
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in boolean aEatContinuation);
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/**
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* Given a header parameter, decodes RFC 2047 style encoding (if it's
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* not obtained from RFC 2231 encoding), converts it to
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* UTF-8 and returns the result in UTF-8 if an attempt to extract
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* charset info. from a few different sources succeeds.
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* Otherwise, returns the input header value (in whatever encoding)
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* as it is except that RFC 822 (using backslash) quotation is
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* stripped off.
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* <p>
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* For internal use only. The only other place where this needs to be
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* invoked is <code>mime_decode_filename</code> in
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* mailnews/mime/src/mimehdrs.cpp defined as
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* char * mime_decode_filename(char *name, const char *charset,
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* MimeDisplayOptions *opt)
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*
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* @param aParamValue the value of a parameter to decode and convert
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* @param aCharset charset obtained from RFC 2231 decoding in which
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* <code>aParamValue</code> is encoded. If null,
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* indicates that it needs to try RFC 2047, instead.
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* @param aDefaultCharset MIME charset to use when aCharset is null and
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* cannot be obtained per RFC 2047 (most likely
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* because 'bare' string is used.) Besides, it
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* overrides aCharset/MIME charset obtained from
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* RFC 2047 if <code>aOverrideCharset</code> is set.
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* @param aOverrideCharset When set, overrides MIME charset specified
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* in RFC 2047 style encoding with
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* <code>aDefaultCharset</code>
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* @return decoded parameter
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*/
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[noscript]
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ACString decodeParameter(in ACString aParamValue,
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in string aCharset,
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in string aDefaultCharset,
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in boolean aOverrideCharset);
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};
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