[PATCH 1/1] enable cgit to show gravatar for author, committer and tagger

[list at eworm.de (Christian Hesse)]

John Keeping <john at keeping.me.uk> on Wed, 2013/11/27 16:37:
> On Wed, Nov 27, 2013 at 04:17:17PM +0100, Christian Hesse wrote:
> > diff --git a/parsing.c b/parsing.c
> > index 658621d..a8005f6 100644
> > --- a/parsing.c
> > +++ b/parsing.c
> > @@ -8,6 +8,9 @@
> >  
> >  #include "cgit.h"
> >  
> > +/* we need md5 hashing algorithm to calculate Gravatar URL */
> > +#include <openssl/md5.h>
> 
> We don't currently depend on OpenSSL, except via Git which can use
> alternative SHA-1 implementations.
> 
> At the very least Debian will not distribute GPL'd packages
> linked against OpenSSL [1].
> 
> [1]
> http://lintian.debian.org/tags/possible-gpl-code-linked-with-openssl.html

Damn licensing stuff... Ok, but cgit is already linked against libcrypt which
belongs to openssl.

Any ideas what to use instead? Shipping a complete MD5 implementation is a
bad idea I think.

> > +char * cgit_get_gravatar(const char * email) {
> > +    	int n, length;
> > +	MD5_CTX c;
> > +	unsigned char digest[16];
> > +	char hex[33];
> > +	char * gravatar = malloc(67);
> > +
> > +	/* skip brackets! */
> > +	email++;
> > +	length = strlen(email) - 1;
> > +
> > +	MD5_Init(&c);
> > +
> > +	while (length > 0) {
> > +		if (length > 512)
> > +			MD5_Update(&c, email, 512);
> > +		else
> > +			MD5_Update(&c, email, length);
> > +		length -= 512;
> > +		email += 512;
> > +	}
> > +
> > +	MD5_Final(digest, &c);
> 
> Would it be possible to extract everything from MD5_Init to MD5_Final to
> a function that just computes the MD5 of a string?  That should make it
> easier to add alternative implementations.

I updated the code to use MD5(...), but that is still openssl.

> > +	for (n = 0; n < 16; ++n)
> > +		snprintf(&(hex[n*2]), 16*2, "%02x", (unsigned
> > int)digest[n]); +
> > +	sprintf(gravatar, "http://www.gravatar.com/avatar/%s?s=", hex);
> > +
> > +	return gravatar;
> > +}

-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Chris           get my mail address:    */=0;b=c[a++];)
putchar(b-1/(/*               gcc -o sig sig.c && ./sig    */b/42*2-3)*42);}
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