Source: yatemime.h

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    /**
     * yatemime.h
     * This file is part of the YATE Project http://YATE.null.ro
     *
     * MIME types, body codecs and related functions
     *
     * Yet Another Telephony Engine - a fully featured software PBX and IVR
     * Copyright (C) 2004-2014 Null Team
     *
     * This software is distributed under multiple licenses;
     * see the COPYING file in the main directory for licensing
     * information for this specific distribution.
     *
     * This use of this software may be subject to additional restrictions.
     * See the LEGAL file in the main directory for details.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
     */

    #ifndef __YATEMIME_H
    #define __YATEMIME_H

    #ifndef __cplusplus
    #error C++ is required
    #endif

    #include

    /**
     * Holds all Telephony Engine related classes.
     */
    namespace TelEngine {

    /**
     * A MIME header line.
     * The NamedString's value contain the first parameter after the header name
     * @short MIME header line
     */
    class YATE_API MimeHeaderLine : public NamedString
    {
    public:
        /**
         * Constructor.
         * Builds a MIME header line from a string buffer.
         * Splits the value into header parameters
         * @param name The header name
         * @param value The header value
         * @param sep Optional parameter separator. If 0, the default ';' will be used
         */
        MimeHeaderLine(const char* name, const String& value, char sep = 0);

        /**
         * Constructor.
         * Builds this MIME header line from another one
         * @param original Original header line to build from.
         * @param newName Optional new header name. If 0, the original name will be used
         */
        MimeHeaderLine(const MimeHeaderLine& original, const char* newName = 0);

        /**
         * Destructor.
         */
        virtual ~MimeHeaderLine();

        /**
         * RTTI method, get a pointer to a derived class given the class name.
         * @param name Name of the class we are asking for
         * @return Pointer to the requested class or NULL if this object doesn't implement it
         */
        virtual void* getObject(const String& name) const;

        /**
         * Duplicate this MIME header line.
         * @param newName Optional new header name. If 0, this header's name will be used
         * @return Copy of this MIME header line
         */
        virtual MimeHeaderLine* clone(const char* newName = 0) const;

        /**
         * Build a string line from this MIME header without adding a line separator
         * @param line Destination string
         * @param header True to add the header in front of line text
         */
        virtual void buildLine(String& line, bool header = true) const;

        /**
         * Assignement operator. Set the header's value
         * @param value The new headr value
         */
        inline MimeHeaderLine& operator=(const char* value)
            { NamedString::operator=(value); return *this; }

        /**
         * Get the header's parameters
         * @return This header's list of parameters
         */
        inline const ObjList& params() const
    	{ return m_params; }

        /**
         * Get the character used as separator in header line
         * @return This header's separator
         */
        inline char separator() const
    	{ return m_separator; }

        /**
         * Replace the value of an existing parameter or add a new one
         * @param name Parameter's name
         * @param value Parameter's value
         */
        void setParam(const char* name, const char* value = 0);

        /**
         * Remove a parameter from list
         * @param name Parameter's name
         */
        void delParam(const char* name);

        /**
         * Get a header parameter
         * @param name Parameter's name
         * @return Pointer to the desired parameter or 0 if not found
         */
        const NamedString* getParam(const char* name) const;

        /**
         * Utility function, puts quotes around a string.
         * @param str String to put quotes around.
         * @param force True to force quoting even if was already quoted
         */
        static void addQuotes(String& str, bool force = false);

        /**
         * Utility function, removes quotes around a string.
         * @param str String to remove quotes.
         * @param force True to force unquoting even if wasn't properly quoted
         */
        static void delQuotes(String& str, bool force = false);

        /**
         * Utility function, puts quotes around a string.
         * @param str String to put quotes around.
         * @param force True to force quoting even if was already quoted
         * @return The input string enclosed in quotes.
         */
        static String quote(const String& str, bool force = false);

        /**
         * Utility function, removes quotes around a string.
         * @param str String to remove quotes around.
         * @param force True to force unquoting even if wasn't properly quoted
         * @return The input string with enclosing quotes removed.
         */
        static String unquote(const String& str, bool force = false);

        /**
         * Utility function to find a separator not in "quotes" or inside \.
         * @param str Input string used to find the separator.
         * @param sep The separator to find.
         * @param offs Starting offset in input string.
         * @return The position of the separator in input string or -1 if not found.
         */
        static int findSep(const char* str, char sep, int offs = 0);

        /**
         * Build a string from a list of MIME header lines.
         * Add a CR/LF terminator after each line
         * @param buf Destination string
         * @param headers The list with the header lines
         */
        static void buildHeaders(String& buf, const ObjList& headers);

    protected:
        ObjList m_params;                    // Header list of parameters
        char m_separator;                    // Parameter separator
    private:
        void operator=(const MimeHeaderLine&); // no assignment
    };

    /**
     * A MIME header line containing authentication data.
     * @short MIME authentication line
     */
    class YATE_API MimeAuthLine : public MimeHeaderLine
    {
    public:
        /**
         * Constructor.
         * Builds a MIME authentication header line from a string buffer.
         * Splits the value into header parameters
         * @param name The header name
         * @param value The header value
         */
        MimeAuthLine(const char* name, const String& value);

        /**
         * Constructor.
         * Builds this MIME authentication header line from another one
         * @param original Original header line to build from.
         * @param newName Optional new header name. If 0, the original name will be used
         */
        MimeAuthLine(const MimeAuthLine& original, const char* newName = 0);

        /**
         * RTTI method, get a pointer to a derived class given the class name.
         * @param name Name of the class we are asking for
         * @return Pointer to the requested class or NULL if this object doesn't implement it
         */
        virtual void* getObject(const String& name) const;

        /**
         * Duplicate this MIME header line.
         * @param newName Optional new header name. If 0, this header's name will be used
         * @return Copy of this MIME header line
         */
        virtual MimeHeaderLine* clone(const char* newName = 0) const;

        /**
         * Build a string line from this MIME header without adding a line separator
         * @param line Destination string
         * @param header True to add the header in front of line text
         */
        virtual void buildLine(String& line, bool header = true) const;

    private:
        void operator=(const MimeAuthLine&); // no assignment
    };

    /**
     * Abstract base class for holding Multipurpose Internet Mail Extensions data.
     * Keeps a Content-Type header line with body type and parameters and
     *  any additional header lines the body may have.
     * The body type contains lower case characters.
     * @short Abstract MIME data holder
     */
    class YATE_API MimeBody : public GenObject
    {
        YNOCOPY(MimeBody); // no automatic copies please
    public:
        /**
         * Destructor
         */
        virtual ~MimeBody();

        /**
         * RTTI method, get a pointer to a derived class given the class name
         * @param name Name of the class we are asking for
         * @return Pointer to the requested class or NULL if this object doesn't implement it
         */
        virtual void* getObject(const String& name) const;

        /**
         * Retrieve the MIME type of this body
         * @return Name of the MIME type/subtype
         */
        inline const MimeHeaderLine& getType() const
    	{ return m_type; }

        /**
         * Get the first body that matches a requested type, descends into multiparts
         * @param type Name of the MIME type to search for
         * @return Pointer to requested body or NULL if not found
         */
        MimeBody* getFirst(const String& type) const;

        /**
         * Retrieve the additional headers of this MIME body (other then Content-Type)
         * @return The list of header lines of this MIME body
         */
        inline const ObjList& headers() const
    	{ return m_headers; }

        /**
         * Append an additional header line to this body
         * @param hdr The header line to append
         */
        inline void appendHdr(MimeHeaderLine* hdr)
    	{ if (hdr) m_headers.append(hdr); }

        /**
         * Remove an additional header line from this body
         * @param hdr The header line to remove
         * @param delobj True to delete the header, false to remove from list without deleting it
         */
        inline void removeHdr(MimeHeaderLine* hdr, bool delobj = true)
    	{ if (hdr) m_headers.remove(hdr,delobj); }

        /**
         * Find an additional header line by its name. The names are compared case insensitive
         * @param name The name of the header to find
         * @param start The starting point in the list. 0 to start from the beginning
         * @return Pointer to MimeHeaderLine or 0 if not found
         */
        MimeHeaderLine* findHdr(const String& name, const MimeHeaderLine* start = 0) const;

        /**
         * Build a string with this body's header lines
         * @param buf Destination string
         */
        inline void buildHeaders(String& buf) {
    	    m_type.buildLine(buf);
    	    buf << "\r\n";
    	    MimeHeaderLine::buildHeaders(buf,m_headers);
    	}

        /**
         * Replace the value of an existing parameter or add a new one
         * @param name Parameter's name
         * @param value Parameter's value
         * @param header Header whose parameter will be changed.
         *  Set to 0 to use the body's content type header
         * @return False if the header doesn't exist
         */
        bool setParam(const char* name, const char* value = 0, const char* header = 0);

        /**
         * Remove a header parameter
         * @param name Parameter's name
         * @param header Header whose parameter will be removed.
         *  Set to 0 to use the body's content type header
         * @return False if the header doesn't exist
         */
        bool delParam(const char* name, const char* header = 0);

        /**
         * Get a header parameter
         * @param name Parameter's name
         * @param header Header whose parameter will be retrieved.
         *  Set to 0 to use the body's content type header
         * @return Pointer to the desired parameter or 0 if not found
         */
        const NamedString* getParam(const char* name, const char* header = 0) const;

        /**
         * Retrieve the binary encoding of this MIME body. Build the body if empty.
         * The body doesn't contain the Content-Type header or the additional headers
         * @return Block of binary data
         */
        const DataBlock& getBody() const;

        /**
         * Get the binary data of this MIME body without building it.
         * @return Block of binary data
         */
        inline const DataBlock& body() const
    	{ return m_body; }

        /**
         * Check if this body is a Session Description Protocol
         * @return True if this body holds a SDP
         */
        virtual bool isSDP() const
    	{ return false; }

        /**
         * Check if this body is multipart (can hold other MIME bodies)
         * @return True if this body is multipart
         */
        virtual bool isMultipart() const
    	{ return false; }

        /**
         * Duplicate this MIME body
         * @return Copy of this MIME body
         */
        virtual MimeBody* clone() const = 0;

        /**
         * Method to build a MIME body from a type and data buffer.
         * Unknown body types are built into a binary body. Exactly 1 leading CRLF
         * is removed from the beginning of the buffer if found before building it
         * @param buf Pointer to buffer of data just after the body headers
         * @param len Length of data in buffer
         * @param type The header line declaring the body's content.
         *  Usually this is a Content-Type header line
         * @return Newly allocated MIME body or NULL if the buffer is empty
         */
        static MimeBody* build(const char* buf, int len, const MimeHeaderLine& type);

        /**
         * Utility method, returns an unfolded line and advances the pointer
         * @param buf Reference to pointer to start of buffer data
         * @param len Reference to variable holding buffer length
         * @return Newly allocated String holding the line of text
         */
        static String* getUnfoldedLine(const char*& buf, int& len);

    protected:
        /**
         * Constructor to be used only by derived classes.
         * Converts the MIME type string to lower case
         * @param type The value of the Content-Type header line
         */
        MimeBody(const String& type);

        /**
         * Constructor to be used only by derived classes.
         * Builds this body from a header line.
         * Converts the MIME type string to lower case
         * @param type The content type header line
         */
        MimeBody(const MimeHeaderLine& type);

        /**
         * Method that is called internally to build the binary encoded body
         */
        virtual void buildBody() const = 0;

        /**
         * Block of binary data that @ref buildBody() must fill
         */
        mutable DataBlock m_body;

        /**
         * Additional body headers (other then Content-Type)
         */
        ObjList m_headers;

    private:
        MimeHeaderLine m_type;               // Content type header line
    };

    /**
     * An object holding the bodies of a multipart MIME
     * @short MIME multipart container
     */
    class YATE_API MimeMultipartBody : public MimeBody
    {
    public:
        /**
         * Constructor to build an empty multipart body
         * @param subtype The multipart subtype
         * @param boundary The string used as separator for enclosed bodies.
         *  A random one will be created if missing. The length will be truncated
         *  to 70 if this value is exceeded
         */
        explicit MimeMultipartBody(const char* subtype = "mixed", const char* boundary = 0);

        /**
         * Constructor from block of data
         * @param type The value of the Content-Type header line
         * @param buf Pointer to buffer of data
         * @param len Length of data in buffer
         */
        MimeMultipartBody(const String& type, const char* buf, int len);

        /**
         * Constructor from block of data
         * @param type The content type header line
         * @param buf Pointer to buffer of data
         * @param len Length of data in buffer
         */
        MimeMultipartBody(const MimeHeaderLine& type, const char* buf, int len);

        /**
         * Destructor
         */
        virtual ~MimeMultipartBody();

        /**
         * Get the list of bodies enclosed contained in this multipart
         * @return The list of bodies enclosed contained in this multipart
         */
        inline const ObjList& bodies() const
    	{ return m_bodies; }

        /**
         * Append a body to this multipart
         * @param body The body to append
         */
        inline void appendBody(MimeBody* body)
    	{ if (body) m_bodies.append(body); }

        /**
         * Remove a body from this multipart
         * @param body The body to remove
         * @param delobj True to delete the body, false to remove from list without deleting it
         */
        inline void removeBody(MimeBody* body, bool delobj = true)
    	{ if (body) m_bodies.remove(body,delobj); }

        /**
         * Find a body. Enclosed multiparts are also searched for the requested body
         * @param content The value of the body to find. Must be lower case
         * @param start The starting point in the list. 0 to start from the beginning.
         *  Be aware that this parameter is used internally to search within enclosed
         *  multipart bodies and set to 0 when the starting point is found
         * @return Pointer to MimeBody or 0 if not found
         */
        MimeBody* findBody(const String& content, MimeBody** start = 0) const;

        /**
         * RTTI method, get a pointer to a derived class given the class name
         * @param name Name of the class we are asking for
         * @return Pointer to the requested class or NULL if this object doesn't implement it
         */
        virtual void* getObject(const String& name) const;

        /**
         * Check if this body is multipart (can hold other MIME bodies)
         * @return True if this body is multipart
         */
        virtual bool isMultipart() const
    	{ return true; }

        /**
         * Duplicate this MIME body
         * @return Copy of this MIME body
         */
        virtual MimeBody* clone() const;

    protected:
        /**
         * Copy constructor
         */
        MimeMultipartBody(const MimeMultipartBody& original);

        /**
         * Method that is called internally to build the binary encoded body
         */
        virtual void buildBody() const;

        /**
         * Parse a data buffer and append any valid body to this multipart
         * Ignore prolog, epilog and invalid bodies
         * @param buf Pointer to buffer of data
         * @param len Length of data in buffer
         */
        void parse(const char* buf, int len);

    private:
        // Parse input buffer for first body boundary or data end
        // Advance buffer pass the boundary line and decrease the buffer length
        // Set endBody to true if the last boundary was found
        // Return the length of data before the found boundary
        int findBoundary(const char*& buf, int& len,
    	const char* boundary, unsigned int bLen, bool& endBody);
        // Build a boundary string to be used when parsing or building body
        // Remove quotes if present. Trim blanks
        // Insert CRLF and boundary marks ('--') before parameter
        // @param boundary Destination string
        // @return False if the parameter is missing or the boundary is empty
        bool getBoundary(String& boundary) const;

        ObjList m_bodies;                    // The list of bodies contained in this multipart
    };

    /**
     * An object holding the lines of an application/sdp MIME type
     * @short MIME for application/sdp
     */
    class YATE_API MimeSdpBody : public MimeBody
    {
    public:
        /**
         * Default constructor, builds an empty application/sdp
         * @param hashing Enable hashing the content lines
         */
        MimeSdpBody(bool hashing = false);

        /**
         * Constructor from block of data
         * @param type The value of the Content-Type header line
         * @param buf Pointer to buffer of data
         * @param len Length of data in buffer
         */
        MimeSdpBody(const String& type, const char* buf, int len);

        /**
         * Constructor from block of data
         * @param type The content type header line
         * @param buf Pointer to buffer of data
         * @param len Length of data in buffer
         */
        MimeSdpBody(const MimeHeaderLine& type, const char* buf, int len);

        /**
         * Destructor
         */
        virtual ~MimeSdpBody();

        /**
         * RTTI method, get a pointer to a derived class given the class name
         * @param name Name of the class we are asking for
         * @return Pointer to the requested class or NULL if this object doesn't implement it
         */
        virtual void* getObject(const String& name) const;

        /**
         * Override that checks if this body is an Session Description Protocol
         * @return True, since this body holds a SDP
         */
        virtual bool isSDP() const
    	{ return true; }

        /**
         * Duplicate this MIME body
         * @return Copy of this MIME body - a new MimeSdpBody
         */
        virtual MimeBody* clone() const;

        /**
         * Retrieve the lines hold in data
         * @return List of NamedStrings
         */
        inline const ObjList& lines() const
    	{ return m_lines; }

        /**
         * Retrieve the hash of body lines
         * @return Hash of body, zero if hashing not enabled
         */
        inline unsigned int hash() const
    	{ return m_hash; }

        /**
         * Append a new name=value line of SDP data
         * @param name Name of the line, should be one character
         * @param value Text of the line
         * @return Pointer to new added line
         */
        NamedString* addLine(const char* name, const char* value = 0);

        /**
         * Retrieve the first line matching a name
         * @param name Name of the line to search
         * @return First instance of the searched name or NULL if none present
         */
        const NamedString* getLine(const char* name) const;

        /**
         * Retrieve the next line of the same type as the current
         * @param line Current line
         * @return Next instance of same name or NULL if no more
         */
        const NamedString* getNextLine(const NamedString* line) const;

    protected:
        /**
         * Copy constructor
         */
        MimeSdpBody(const MimeSdpBody& original);

        /**
         * Override that is called internally to build the binary encoded body
         */
        virtual void buildBody() const;

    private:
        // Build the lines from a data buffer
        void buildLines(const char* buf, int len);

        ObjList m_lines;
        ObjList* m_lineAppend;
        unsigned int m_hash;
        bool m_hashing;
    };

    /**
     * An object holding a binary block of MIME data
     * @short MIME for obscure binary data
     */
    class YATE_API MimeBinaryBody : public MimeBody
    {
    public:
        /**
         * Constructor from block of data
         * @param type The value of the Content-Type header line
         * @param buf Pointer to buffer of data
         * @param len Length of data in buffer
         */
        MimeBinaryBody(const String& type, const char* buf, int len);

        /**
         * Constructor from block of data
         * @param type The content type header line
         * @param buf Pointer to buffer of data
         * @param len Length of data in buffer
         */
        MimeBinaryBody(const MimeHeaderLine& type, const char* buf, int len);

        /**
         * Destructor
         */
        virtual ~MimeBinaryBody();

        /**
         * RTTI method, get a pointer to a derived class given the class name
         * @param name Name of the class we are asking for
         * @return Pointer to the requested class or NULL if this object doesn't implement it
         */
        virtual void* getObject(const String& name) const;

        /**
         * Duplicate this MIME body
         * @return Copy of this MIME body - a new MimeBinaryBody
         */
        virtual MimeBody* clone() const;

    protected:
        /**
         * Copy constructor
         */
        MimeBinaryBody(const MimeBinaryBody& original);

        /**
         * Override that is called internally to build the binary encoded body
         */
        virtual void buildBody() const;
    };

    /**
     * An object holding MIME data as just one text string
     * @short MIME for one text string
     */
    class YATE_API MimeStringBody : public MimeBody
    {
    public:
        /**
         * Constructor from block of data
         * @param type The value of the Content-Type header line
         * @param buf Pointer to buffer of data
         * @param len Length of data in buffer
         */
        MimeStringBody(const String& type, const char* buf, int len = -1);

        /**
         * Constructor from block of data
         * @param type The content type header line
         * @param buf Pointer to buffer of data
         * @param len Length of data in buffer
         */
        MimeStringBody(const MimeHeaderLine& type, const char* buf, int len = -1);

        /**
         * Destructor
         */
        virtual ~MimeStringBody();

        /**
         * RTTI method, get a pointer to a derived class given the class name
         * @param name Name of the class we are asking for
         * @return Pointer to the requested class or NULL if this object doesn't implement it
         */
        virtual void* getObject(const String& name) const;

        /**
         * Duplicate this MIME body
         * @return Copy of this MIME body - a new MimeStringBody
         */
        virtual MimeBody* clone() const;

        /**
         * Retrieve the stored data
         * @return String holding the data text
         */
        inline const String& text() const
    	{ return m_text; }

    protected:
        /**
         * Copy constructor
         */
        MimeStringBody(const MimeStringBody& original);

        /**
         * Override that is called internally to build the binary encoded body
         */
        virtual void buildBody() const;

    private:
        String m_text;
    };

    /**
     * An object holding MIME data as separate text lines
     * @short MIME for multiple text lines
     */
    class YATE_API MimeLinesBody : public MimeBody
    {
    public:
        /**
         * Constructor from block of data
         * @param type The value of the Content-Type header line
         * @param buf Pointer to buffer of data
         * @param len Length of data in buffer
         */
        MimeLinesBody(const String& type, const char* buf, int len);

        /**
         * Constructor from block of data
         * @param type The content type header line
         * @param buf Pointer to buffer of data
         * @param len Length of data in buffer
         */
        MimeLinesBody(const MimeHeaderLine& type, const char* buf, int len);

        /**
         * Destructor
         */
        virtual ~MimeLinesBody();

        /**
         * RTTI method, get a pointer to a derived class given the class name
         * @param name Name of the class we are asking for
         * @return Pointer to the requested class or NULL if this object doesn't implement it
         */
        virtual void* getObject(const String& name) const;

        /**
         * Duplicate this MIME body
         * @return Copy of this MIME body - a new MimeLinesBody
         */
        virtual MimeBody* clone() const;

        /**
         * Retrieve the stored lines of text
         * @return List of Strings
         */
        inline const ObjList& lines() const
    	{ return m_lines; }

        /**
         * Append a line of text to the data
         * @param line Text to append
         */
        inline void addLine(const char* line)
    	{ m_lines.append(new String(line)); }

    protected:
        /**
         * Copy constructor
         */
        MimeLinesBody(const MimeLinesBody& original);

        /**
         * Override that is called internally to build the binary encoded body
         */
        virtual void buildBody() const;

    private:
        ObjList m_lines;
    };

    }; // namespace TelEngine

    #endif /* __YATEMIME_H */

    /* vi: set ts=8 sw=4 sts=4 noet: */

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