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POP3: Check for support of the TOP command (if CAPA isn't supported)

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This will allow to download partial messages if the server doesn't
support the CAPA command but supports the TOP command (e.g. Hotmail).

Fixes issue 2042
This commit is contained in:
cketti 2011-05-14 21:40:21 +02:00
parent 969e2d93fd
commit 86fca9c1f2
1 changed files with 79 additions and 29 deletions
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108
src/com/fsck/k9/mail/store/Pop3Store.java
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@ -43,6 +43,13 @@ public class Pop3Store extends Store {
private HashMap<String, Folder> mFolders = new HashMap<String, Folder>();
private Pop3Capabilities mCapabilities;
/**
* This value is {@code true} if the server supports the CAPA command but doesn't advertise
* support for the TOP command OR if the server doesn't support the CAPA command and we
* already unsuccessfully tried to use the TOP command.
*/
private boolean mTopNotSupported;
/**
* pop3://user:password@server:port CONNECTION_SECURITY_NONE
* pop3+tls://user:password@server:port CONNECTION_SECURITY_TLS_OPTIONAL
@ -656,41 +663,67 @@ public class Pop3Store extends Store {
}
/**
* Fetches the body of the given message, limiting the stored data
* to the specified number of lines. If lines is -1 the entire message
* is fetched. This is implemented with RETR for lines = -1 or TOP
* for any other value. If the server does not support TOP it is
* emulated with RETR and extra lines are thrown away.
* @param message
* @param lines
* Fetches the body of the given message, limiting the downloaded data to the specified
* number of lines if possible.
*
* If lines is -1 the entire message is fetched. This is implemented with RETR for
* lines = -1 or TOP for any other value. If the server does not support TOP, RETR is used
* instead.
*/
private void fetchBody(Pop3Message message, int lines)
throws IOException, MessagingException {
String response = null;
if (lines == -1 || !mCapabilities.top) {
// Try hard to use the TOP command if we're not asked to download the whole message.
if (lines != -1 && (!mTopNotSupported || mCapabilities.top)) {
try {
if (K9.DEBUG && K9.DEBUG_PROTOCOL_POP3 && !mCapabilities.top) {
Log.d(K9.LOG_TAG, "This server doesn't support the CAPA command. " +
"Checking to see if the TOP command is supported nevertheless.");
}
response = executeSimpleCommand(String.format("TOP %d %d",
mUidToMsgNumMap.get(message.getUid()), lines));
// TOP command is supported. Remember this for the next time.
mCapabilities.top = true;
} catch (Pop3ErrorResponse e) {
if (mCapabilities.top) {
// The TOP command should be supported but something went wrong.
throw e;
} else {
if (K9.DEBUG && K9.DEBUG_PROTOCOL_POP3) {
Log.d(K9.LOG_TAG, "The server really doesn't support the TOP " +
"command. Using RETR instead.");
}
// Don't try to use the TOP command again.
mTopNotSupported = true;
}
}
}
if (response == null) {
response = executeSimpleCommand(String.format("RETR %d",
mUidToMsgNumMap.get(message.getUid())));
} else {
response = executeSimpleCommand(String.format("TOP %d %d",
mUidToMsgNumMap.get(message.getUid()),
lines));
}
if (response != null) {
try {
message.parse(new Pop3ResponseInputStream(mIn));
if (lines == -1 || !mCapabilities.top) {
message.setFlag(Flag.X_DOWNLOADED_FULL, true);
}
} catch (MessagingException me) {
/*
* If we're only downloading headers it's possible
* we'll get a broken MIME message which we're not
* real worried about. If we've downloaded the body
* and can't parse it we need to let the user know.
*/
if (lines == -1) {
throw me;
}
try {
message.parse(new Pop3ResponseInputStream(mIn));
// TODO: if we've received fewer lines than requested we also have the complete message.
if (lines == -1 || !mCapabilities.top) {
message.setFlag(Flag.X_DOWNLOADED_FULL, true);
}
} catch (MessagingException me) {
/*
* If we're only downloading headers it's possible
* we'll get a broken MIME message which we're not
* real worried about. If we've downloaded the body
* and can't parse it we need to let the user know.
*/
if (lines == -1) {
throw me;
}
}
}
@ -806,6 +839,14 @@ public class Pop3Store extends Store {
capabilities.top = true;
}
}
if (!capabilities.top) {
/*
* If the CAPA command is supported but it doesn't advertise support for the
* TOP command, we won't check for it manually.
*/
mTopNotSupported = true;
}
} catch (MessagingException me) {
/*
* The server may not support the CAPA command, so we just eat this Exception
@ -838,7 +879,7 @@ public class Pop3Store extends Store {
String response = readLine();
if (response.length() > 1 && response.charAt(0) == '-') {
throw new MessagingException(response);
throw new Pop3ErrorResponse(response);
}
return response;
@ -953,4 +994,13 @@ public class Pop3Store extends Store {
return d;
}
}
/**
* Exception that is thrown if the server returns an error response.
*/
static class Pop3ErrorResponse extends MessagingException {
public Pop3ErrorResponse(String message) {
super(message, true);
}
}
}