Re: [PATCH 2/2] cli: clean up user address matching code in guess_from_received_header()

[Austin Clements <amdragon@MIT.EDU>]

Series LGTM.  This is a nice cleanup.

My one comment is that it seems like we should be stricter about
matching email address lists, since a naive substring match could
yield strange results.  That's not something that should be changed in
this patch, though.

Does the context of this patch conflict with
id:"21a946917c5c8dd63295b7c87b7c2d1ebcb6e71e.1336746160.git.jani@nikula.org"
?  It seems like both have context that's changed by the other patch.

Quoth Jani Nikula on May 11 at  5:33 pm:
> Get rid of user address matching code duplication in
> guess_from_received_header() by using the new address matching
> helpers.
> 
> No functional changes.
> 
> Signed-off-by: Jani Nikula <jani@nikula.org>
> ---
>  notmuch-reply.c |   64 +++++++++++++++++--------------------------------------
>  1 file changed, 19 insertions(+), 45 deletions(-)
> 
> diff --git a/notmuch-reply.c b/notmuch-reply.c
> index 0c82755..51cb6de 100644
> --- a/notmuch-reply.c
> +++ b/notmuch-reply.c
> @@ -377,20 +377,15 @@ add_recipients_from_message (GMimeMessage *reply,
>  static const char *
>  guess_from_received_header (notmuch_config_t *config, notmuch_message_t *message)
>  {
> -    const char *received,*primary,*by;
> -    const char **other;
> -    char *tohdr;
> +    const char *addr, *received, *by;
>      char *mta,*ptr,*token;
>      char *domain=NULL;
>      char *tld=NULL;
>      const char *delim=". \t";
> -    size_t i,j,other_len;
> +    size_t i;
>  
>      const char *to_headers[] = {"Envelope-to", "X-Original-To"};
>  
> -    primary = notmuch_config_get_user_primary_email (config);
> -    other = notmuch_config_get_user_other_email (config, &other_len);
> -
>      /* sadly, there is no standard way to find out to which email
>       * address a mail was delivered - what is in the headers depends
>       * on the MTAs used along the way. So we are trying a number of
> @@ -405,23 +400,13 @@ guess_from_received_header (notmuch_config_t *config, notmuch_message_t *message
>       *    'by' part of Received headers
>       * If none of these work, we give up and return NULL
>       */
> -    for (i = 0; i < sizeof(to_headers)/sizeof(*to_headers); i++) {
> -	tohdr = xstrdup(notmuch_message_get_header (message, to_headers[i]));
> -	if (tohdr && *tohdr) {
> -	    /* tohdr is potentialy a list of email addresses, so here we
> -	     * check if one of the email addresses is a substring of tohdr
> -	     */
> -	    if (strcasestr(tohdr, primary)) {
> -		free(tohdr);
> -		return primary;
> -	    }
> -	    for (j = 0; j < other_len; j++)
> -		if (strcasestr (tohdr, other[j])) {
> -		    free(tohdr);
> -		    return other[j];
> -		}
> -	    free(tohdr);
> -	}
> +    for (i = 0; i < ARRAY_SIZE (to_headers); i++) {
> +	const char *tohdr = notmuch_message_get_header (message, to_headers[i]);
> +
> +	/* Note: tohdr potentially contains a list of email addresses. */
> +	addr = user_address_in_string (tohdr, config);
> +	if (addr)
> +	    return addr;
>      }
>  
>      /* We get the concatenated Received: headers and search from the
> @@ -439,19 +424,12 @@ guess_from_received_header (notmuch_config_t *config, notmuch_message_t *message
>       * header
>       */
>      ptr = strstr (received, " for ");
> -    if (ptr) {
> -	/* the text following is potentialy a list of email addresses,
> -	 * so again we check if one of the email addresses is a
> -	 * substring of ptr
> -	 */
> -	if (strcasestr(ptr, primary)) {
> -	    return primary;
> -	}
> -	for (i = 0; i < other_len; i++)
> -	    if (strcasestr (ptr, other[i])) {
> -		return other[i];
> -	    }
> -    }
> +
> +    /* Note: ptr potentially contains a list of email addresses. */
> +    addr = user_address_in_string (ptr, config);
> +    if (addr)
> +	return addr;
> +
>      /* Finally, we parse all the " by MTA ..." headers to guess the
>       * email address that this was originally delivered to.
>       * We extract just the MTA here by removing leading whitespace and
> @@ -492,15 +470,11 @@ guess_from_received_header (notmuch_config_t *config, notmuch_message_t *message
>  	     */
>  	    *(tld-1) = '.';
>  
> -	    if (strcasestr(primary, domain)) {
> -		free(mta);
> -		return primary;
> +	    addr = string_in_user_address (domain, config);
> +	    if (addr) {
> +		free (mta);
> +		return addr;
>  	    }
> -	    for (i = 0; i < other_len; i++)
> -		if (strcasestr (other[i],domain)) {
> -		    free(mta);
> -		    return other[i];
> -		}
>  	}
>  	free (mta);
>      }