/// <summary>
/// Verifies that a header name matches name of the associate header, with MIME string comparison semantics.
/// </summary>
/// <param name="name">The header name to verify</param>
/// <param name="header">The <see cref="Header"/> to verify against.</param>
static void VerifyName(string name, Header header)
{
if (!MimeStandard.Equals(name, header.Name))
{
throw new MimeException(MimeError.InvalidHeader);
}
}
static EncodedLine LineFromSegment(StringSegment segment, bool hasCRLF)
{
//
// Skip any trailing white space. RFC 2045, Section 6.7, Rule #3
// Whitespace is defined as MimeStandard.IsWhiteSpace
//
int endAt = segment.Length - 1;
for (; endAt >= 0; --endAt)
{
if (!MimeStandard.IsWhitespace(segment[endAt]))
{
break;
}
}
StringSegment cleanSegment;
if (endAt < 0)
{
cleanSegment = StringSegment.Null;
}
else
{
cleanSegment = new StringSegment(segment.Source, segment.StartIndex, segment.StartIndex + endAt);
}
return(new EncodedLine
{
Text = cleanSegment,
HasCRLF = hasCRLF
});
}
/// <summary>
/// Returns all values for the given paramName
/// </summary>
/// <param name="paramName"></param>
/// <returns></returns>
public IEnumerable <string> GetValues(string paramName)
{
return(
from nv in this
where MimeStandard.Equals(nv.Key, paramName)
select nv.Value
);
}
/// <summary>
/// Tests if this header is named the supplied <paramref name="name"/>
/// </summary>
/// <param name="name">The name to test this header's name against</param>
/// <returns><c>true</c> if the names match by MIME string comparison rules</returns>
public bool IsNamed(string name)
{
if (string.IsNullOrEmpty(name))
{
return(false);
}
return(MimeStandard.Equals(this.Name, name));
}
/// <summary>
/// Tests if this content type has the named parameter and parameter value.
/// </summary>
/// <param name="contentType">The content type to test</param>
/// <param name="parameter">The parameter name to test</param>
/// <param name="value">The parameter value to test</param>
/// <returns><c>true</c> if the content type has the named parameter with the parameter value</returns>
public static bool HasParameter(this ContentType contentType, string parameter, string value)
{
string paramValue = contentType.Parameters[parameter];
if (paramValue == null)
{
return(false);
}
return(MimeStandard.Equals(paramValue, value));
}
/// <summary>
/// Tests if this entity has the named header with a value, using MIME-appropriate string comparison.
/// </summary>
/// <param name="name">The header name to test for.</param>
/// <param name="value">The value to test</param>
/// <returns><c>true</c> if the entity has the named header and the header has the appropriate value, <c>false</c> otherwise</returns>
public bool HasHeader(string name, string value)
{
if (!this.HasHeaders)
{
return(false);
}
Header header = m_headers[name];
return(header != null && MimeStandard.Equals(header.Value, value));
}
/// <summary>
/// Parses the ContentTransferEncoding header, if any.
/// If no header specified, returns SevenBit, the default
/// If transfer encoding not recognized, returns TransferEncoding.Unknown
/// </summary>
/// <returns>The transfer encoding for this Mime Entity</returns>
public TransferEncoding GetTransferEncoding()
{
TransferEncoding encoding = TransferEncoding.SevenBit;
string transferEncodingHeader = this.ContentTransferEncoding;
if (!string.IsNullOrEmpty(transferEncodingHeader))
{
encoding = MimeStandard.ToTransferEncoding(transferEncodingHeader);
}
return(encoding);
}
/// <summary>
/// Advances the start position of <paramref name="text"/> to the first non-whitespace position
/// </summary>
/// <param name="text">The <see cref="StringSegment"/> potentially containing initial whitepace</param>
/// <returns>A <see cref="StringSegment"/> with no intial whitespace (possibly an empty segment if the <paramref name="text"/> was empty or all whitespace)</returns>
public static StringSegment SkipWhitespace(StringSegment text)
{
CharReader reader = new CharReader(text);
char ch;
while ((ch = reader.Read()) != CharReader.EOF && MimeStandard.IsWhitespace(ch))
{
// quick skip
}
return(new StringSegment(text.Source, reader.Position, text.EndIndex));
}
/// <summary>
/// Parse each line in lines as a <see cref="Header"/>.
/// </summary>
/// <param name="lines">The lines to parse.</param>
/// <returns>The parsed enumeration of <see cref="Header"/> instances.</returns>
public static IEnumerable <Header> ReadHeaders(IEnumerable <StringSegment> lines)
{
if (lines == null)
{
throw new ArgumentNullException("lines");
}
Header header = null;
foreach (StringSegment line in lines)
{
if (line.IsEmpty)
{
if (header != null)
{
yield return(header);
header = null;
}
//
// Done with the header section. Onto the Body, so we're done
//
break;
}
if (MimeStandard.IsWhitespace(line[0]))
{
// Line folding. This line belongs to the current header
if (header == null)
{
throw new MimeException(MimeError.InvalidHeader);
}
header.AppendSourceText(line);
}
else
{
if (header != null)
{
yield return(header);
}
header = new Header(line);
}
}
if (header != null)
{
yield return(header);
}
}
/// <summary>
/// Return the index of the first matching field
/// </summary>
/// <param name="field"></param>
/// <returns>-1 if field not found. Else >= 0</returns>
public int IndexOfFirst(KeyValuePair <string, string> field)
{
for (int i = 0, count = this.Count; i < count; ++i)
{
KeyValuePair <string, string> foundField = this[i];
if (MimeStandard.Equals(foundField.Key, field.Key) &&
MimeStandard.Equals(foundField.Value, field.Value)
)
{
return(i);
}
}
return(-1);
}
/// <summary>
/// Returns the index of the first parameter with this name
/// </summary>
/// <param name="paramName"></param>
/// <returns></returns>
public int IndexOfFirst(string paramName)
{
if (string.IsNullOrEmpty(paramName))
{
throw new ArgumentException("paramName");
}
for (int i = 0, count = this.Count; i < count; ++i)
{
if (MimeStandard.Equals(this[i].Key, paramName))
{
return(i);
}
}
return(-1);
}
/// <summary>
/// Returns the index to a header name. See <see cref="HeaderCollection"/> for more details.
/// </summary>
/// <remarks>
/// Headers are not case sensitive, so <c>myHeaders.IndexOf("content-type")</c> and
/// <c>myHeaders.IndexOf("Content-Type")</c>
/// will refer to the same header value.
/// </remarks>
/// <param name="name">The name of the header to get or set. See remarks.</param>
/// <returns>The zero-based index of the named header or -1 if the header was not found.</returns>
public int IndexOf(string name)
{
if (string.IsNullOrEmpty(name))
{
throw new ArgumentException("name was null or empty", "name");
}
for (int i = 0, count = Count; i < count; ++i)
{
if (MimeStandard.Equals(this[i].Name, name))
{
return(i);
}
}
return(-1);
}
/// <summary>
/// Tests if this header is named one of the supplied <paramref name="names"/>
/// </summary>
/// <param name="names">The names to test this header's name against</param>
/// <returns><c>true</c> if this header matches one of the supplied names match by MIME string comparison rules</returns>
public bool IsHeaderNameOneOf(string[] names)
{
if (names == null || names.Length == 0)
{
return(false);
}
string name = this.Name;
for (int i = 0; i < names.Length; ++i)
{
if (MimeStandard.Equals(names[i], name))
{
return(true);
}
}
return(false);
}
/// <summary>
/// Tests if this content type is same one represented by the specified <paramref name="mediaType"/>
/// </summary>
/// <param name="contentType">This <see cref="ContentType"/></param>
/// <param name="mediaType">The content type string to test against this instance.</param>
/// <returns></returns>
public static bool IsMediaType(this ContentType contentType, string mediaType)
{
return(MimeStandard.Equals(contentType.MediaType, mediaType));
}
/// <summary>
/// Parses the supplied <paramref name="lines"/> into constituent <see cref="MimePart"/> instances
/// </summary>
/// <remarks>
/// This is the main parser interface. The <see cref="MimePart"/> instances expected to be returned are <see cref="Header"/> (one for each header), and <see cref="Body"/>
/// </remarks>
/// <param name="lines">The enumeration of <see cref="StringSegment"/> lines to parse</param>
/// <returns>An enumeration of the constituent <see cref="MimePart"/> instances parsed from the <paramref name="lines"/></returns>
public static IEnumerable <MimePart> ReadMimeParts(IEnumerable <StringSegment> lines)
{
if (lines == null)
{
throw new ArgumentNullException("lines");
}
MimePartType expectedPartType = MimePartType.Header;
Header header = null;
Body body = null;
foreach (StringSegment line in lines)
{
switch (expectedPartType)
{
default:
throw new MimeException(MimeError.Unexpected);
case MimePartType.Header:
if (line.IsEmpty)
{
if (header != null)
{
yield return(header);
header = null;
}
yield return(new MimePart(MimePartType.HeaderBoundary, line));
//
// Done with the header section. Onto the Body
//
expectedPartType = MimePartType.Body;
break;
}
if (MimeStandard.IsWhitespace(line[0]))
{
// Line folding. This line belongs to the current header
if (header == null)
{
throw new MimeException(MimeError.InvalidHeader);
}
header.AppendSourceText(line);
break;
}
if (header != null)
{
yield return(header);
}
header = new Header(line);
break;
case MimePartType.Body:
if (body == null)
{
body = new Body(line);
}
else
{
body.AppendSourceText(line);
}
break;
}
}
if (header != null)
{
yield return(header);
}
if (body != null)
{
yield return(body);
}
}
/// <summary>
/// Returns a string representation of <paramref name="encoding"/> compatable with the <c>micalg</c> parameter
/// </summary>
/// <param name="encoding">The <see cref="TransferEncoding"/> to stringify.</param>
/// <returns>The string representation of the encoding compatable with the <c>Content-Transfer-Encoding</c> header</returns>
public static string AsString(this TransferEncoding encoding)
{
return(MimeStandard.ToString(encoding));
}
/// <summary>
/// Tests if this collection has the named header with a value, using MIME-appropriate string comparison.
/// </summary>
/// <param name="name">The header name to test for.</param>
/// <param name="value">The value to test</param>
/// <returns><c>true</c> if the collection has the named header and the header has the appropriate value, <c>false</c> otherwise</returns>
public bool HasHeader(string name, string value)
{
Header header = this[name];
return(header != null && MimeStandard.Equals(header.Value, value));
}
