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Filename: dc_aheader.c |
```c |
#include <ctype.h> |
#include "dc_context.h" |
#include "dc_aheader.h" |
#include "dc_apeerstate.h" |
#include "dc_mimeparser.h" |
/** |
* Empty an Autocrypt-header object and free all data associated with it. |
* |
* @private @memberof dc_aheader_t |
* @param aheader The Autocrypt-header object. If you pass NULL here, the function does nothing. |
* @return None. |
*/ |
void dc_aheader_empty(dc_aheader_t* aheader) |
{ |
if (aheader==NULL) { |
return; |
} |
aheader->prefer_encrypt = 0; |
free(aheader->addr); |
aheader->addr = NULL; |
if (aheader->public_key->binary) { |
dc_key_unref(aheader->public_key); |
aheader->public_key = dc_key_new(); |
} |
} |
/******************************************************************************* |
* Render Autocrypt Header |
******************************************************************************/ |
/** |
* @memberof dc_aheader_t |
*/ |
char* dc_aheader_render(const dc_aheader_t* aheader) |
{ |
int success = 0; |
char* keybase64_wrapped = NULL; |
dc_strbuilder_t ret; |
dc_strbuilder_init(&ret, 0); |
if (aheader==NULL || aheader->addr==NULL || aheader->public_key->binary==NULL || aheader->public_key->type!=DC_KEY_PUBLIC) { |
goto cleanup; |
} |
dc_strbuilder_cat(&ret, "addr="); |
dc_strbuilder_cat(&ret, aheader->addr); |
dc_strbuilder_cat(&ret, "; "); |
if (aheader->prefer_encrypt==DC_PE_MUTUAL) { |
dc_strbuilder_cat(&ret, "prefer-encrypt=mutual; "); |
} |
dc_strbuilder_cat(&ret, "keydata= "); /* the trailing space together with dc_insert_breaks() allows a proper transport */ |
/* adds a whitespace every 78 characters, this allows libEtPan to wrap the lines according to RFC 5322 |
(which may insert a linebreak before every whitespace) */ |
if ((keybase64_wrapped = dc_key_render_base64(aheader->public_key, 78, " ", 0/*no checksum*/))==NULL) { |
goto cleanup; |
} |
dc_strbuilder_cat(&ret, keybase64_wrapped); |
success = 1; |
cleanup: |
if (!success) { free(ret.buf); ret.buf = NULL; } |
free(keybase64_wrapped); |
return ret.buf; /* NULL on errors, this may happen for various reasons */ |
} |
/******************************************************************************* |
* Parse Autocrypt Header |
******************************************************************************/ |
static int add_attribute(dc_aheader_t* aheader, const char* name, const char* value /*may be NULL*/) |
{ |
/* returns 0 if the attribute will result in an invalid header, 1 if the attribute is okay */ |
if (strcasecmp(name, "addr")==0) |
{ |
if (value==NULL |
|| !dc_may_be_valid_addr(value) |
|| aheader->addr /* email already given */) { |
return 0; |
} |
aheader->addr = dc_addr_normalize(value); |
return 1; |
} |
#if 0 /* autocrypt 11/2017 no longer uses the type attribute and it will make the autocrypt header invalid */ |
else if (strcasecmp(name, "type")==0) |
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