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#include "cache.h"

#include "lockfile.h"

#include "credential.h"

#include "string-list.h"

#include "parse-options.h"

static struct lock_file credential_lock;

static int parse_credential_file(const char *fn,

struct credential *c,

void (*match_cb)(struct credential *),

void (*other_cb)(struct strbuf *))

{

FILE *fh;

struct strbuf line = STRBUF_INIT;

struct credential entry = CREDENTIAL_INIT;

int found_credential = 0;

fh = fopen(fn, "r");

if (!fh) {

if (errno != ENOENT && errno != EACCES)

die_errno("unable to open %s", fn);

return found_credential;

}

while (strbuf_getline_lf(&line, fh) != EOF) {

credential_from_url(&entry, line.buf);

if (entry.username && entry.password &&

credential_match(c, &entry)) {

found_credential = 1;

if (match_cb) {

match_cb(&entry);

break;

}

}

else if (other_cb)

other_cb(&line);

}

credential_clear(&entry);

strbuf_release(&line);

fclose(fh);

return found_credential;

}

static void print_entry(struct credential *c)

{

printf("username=%s\n", c->username);

printf("password=%s\n", c->password);

}

static void print_line(struct strbuf *buf)

{

strbuf_addch(buf, '\n');

write_or_die(get_lock_file_fd(&credential_lock), buf->buf, buf->len);

}

static void rewrite_credential_file(const char *fn, struct credential *c,

struct strbuf *extra)

{

if (hold_lock_file_for_update(&credential_lock, fn, 0) < 0)

die_errno("unable to get credential storage lock");

if (extra)

print_line(extra);

parse_credential_file(fn, c, NULL, print_line);

if (commit_lock_file(&credential_lock) < 0)

die_errno("unable to write credential store");

}

static void store_credential_file(const char *fn, struct credential *c)

{

struct strbuf buf = STRBUF_INIT;

strbuf_addf(&buf, "%s://", c->protocol);

strbuf_addstr_urlencode(&buf, c->username, 1);

strbuf_addch(&buf, ':');

strbuf_addstr_urlencode(&buf, c->password, 1);

strbuf_addch(&buf, '@');

if (c->host)

strbuf_addstr_urlencode(&buf, c->host, 1);

if (c->path) {

strbuf_addch(&buf, '/');

strbuf_addstr_urlencode(&buf, c->path, 0);

}

rewrite_credential_file(fn, c, &buf);

strbuf_release(&buf);

}

static void store_credential(const struct string_list *fns, struct credential *c)

{

struct string_list_item *fn;

/*

* Sanity check that what we are storing is actually sensible.

* In particular, we can't make a URL without a protocol field.

* Without either a host or pathname (depending on the scheme),

* we have no primary key. And without a username and password,

* we are not actually storing a credential.

*/

if (!c->protocol || !(c->host || c->path) || !c->username || !c->password)

return;

for_each_string_list_item(fn, fns)

if (!access(fn->string, F_OK)) {

store_credential_file(fn->string, c);

return;

}

/*

* Write credential to the filename specified by fns->items[0], thus

* creating it

*/

if (fns->nr)

store_credential_file(fns->items[0].string, c);

}

static void remove_credential(const struct string_list *fns, struct credential *c)

{

struct string_list_item *fn;

/*

* Sanity check that we actually have something to match

* against. The input we get is a restrictive pattern,

* so technically a blank credential means "erase everything".

* But it is too easy to accidentally send this, since it is equivalent

* to empty input. So explicitly disallow it, and require that the

* pattern have some actual content to match.

*/

if (!c->protocol && !c->host && !c->path && !c->username)

return;

for_each_string_list_item(fn, fns)

if (!access(fn->string, F_OK))

rewrite_credential_file(fn->string, c, NULL);

}

static void lookup_credential(const struct string_list *fns, struct credential *c)

{

struct string_list_item *fn;

for_each_string_list_item(fn, fns)

if (parse_credential_file(fn->string, c, print_entry, NULL))

return; /* Found credential */

}

int cmd_main(int argc, const char **argv)

{

const char * const usage[] = {

"git credential-store [<options>] <action>",

NULL

};

const char *op;

struct credential c = CREDENTIAL_INIT;

struct string_list fns = STRING_LIST_INIT_DUP;

char *file = NULL;

struct option options[] = {

OPT_STRING(0, "file", &file, "path",

"fetch and store credentials in <path>"),

OPT_END()

};

umask(077);

argc = parse_options(argc, (const char **)argv, NULL, options, usage, 0);

if (argc != 1)

usage_with_options(usage, options);

op = argv[0];

if (file) {

string_list_append(&fns, file);

} else {

if ((file = expand_user_path("~/.git-credentials")))

string_list_append_nodup(&fns, file);

file = xdg_config_home("credentials");

if (file)

string_list_append_nodup(&fns, file);

}

if (!fns.nr)

die("unable to set up default path; use --file");

if (credential_read(&c, stdin) < 0)

die("unable to read credential");

if (!strcmp(op, "get"))

lookup_credential(&fns, &c);

else if (!strcmp(op, "erase"))

remove_credential(&fns, &c);

else if (!strcmp(op, "store"))

store_credential(&fns, &c);

else

; /* Ignore unknown operation. */

string_list_clear(&fns, 0);

return 0;

}