pop3-migration: Strip trailing spaces from headers when calculating hash

Fixes matching mails with Zimbra.

src/plugins/pop3-migration/pop3-migration-plugin.c

@@ -168,7 +168,21 @@ pop3_header_filter_callback(struct header_filter_istream *input ATTR_UNUSED,
 			/* Yahoo IMAP drops headers with invalid names, while
 			   Yahoo POP3 preserves them. Drop them all. */
 			*matched = TRUE;
-		}
+		} else if (hdr->value_len > 0 &&
+			   hdr->value[hdr->value_len-1] == ' ') T_BEGIN {
+			/* Delete trailing whitespace. Zimbra is stripping it
+			   away with BODY[HEADER]. */
+			struct message_header_line new_hdr = *hdr;
+			while (new_hdr.value_len > 0 &&
+			       new_hdr.value[new_hdr.value_len-1] == ' ')
+				new_hdr.value_len--;
+			new_hdr.crlf_newline = FALSE; /* CRs are stripped */
+			string_t *new_line = t_str_new(128);
+			message_header_line_write(new_line, &new_hdr);
+			i_stream_header_filter_add(input, str_data(new_line),
+						   str_len(new_line));
+			*matched = TRUE;
+		} T_END;
 	}
 }
 

src/plugins/pop3-migration/test-pop3-migration-plugin.c

@@ -17,6 +17,9 @@ static void test_pop3_migration_get_hdr_sha1(void)
 		{ "", "da39a3ee5e6b4b0d3255bfef95601890afd80709", FALSE },
 		{ "\n", "adc83b19e793491b1c6ea0fd8b46cd9f32e592fc", TRUE },
 		{ "a: b\r\n", "3edb5ce145cf1d1e2413e02b8bed70f1ae3ed105", FALSE },
+		{ "a: b \r\n", "3edb5ce145cf1d1e2413e02b8bed70f1ae3ed105", FALSE },
+		{ "a: b  \r\n", "3edb5ce145cf1d1e2413e02b8bed70f1ae3ed105", FALSE },
+		{ "a: b     \r\n", "3edb5ce145cf1d1e2413e02b8bed70f1ae3ed105", FALSE },
 		{ "a: b\r\n\r\n", "d14841695e1d9e2de6625d9222abd149ec821b0d", TRUE },
 		{ "a: b\r\n\r\r\n", "3edb5ce145cf1d1e2413e02b8bed70f1ae3ed105", FALSE },
 		{ "a: b\r\n\r\r\nc: d\r\n\r\n", "3edb5ce145cf1d1e2413e02b8bed70f1ae3ed105", TRUE }