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#include "cache.h"
#include "commit.h"
#include "pack.h"
#include "fetch.h"

#include <curl/curl.h>
#include <curl/easy.h>

#if LIBCURL_VERSION_NUM < 0x070704
#define curl_global_cleanup() do { /* nothing */ } while(0)
#endif
#if LIBCURL_VERSION_NUM < 0x070800
#define curl_global_init(a) do { /* nothing */ } while(0)
#endif

#define PREV_BUF_SIZE 4096
#define RANGE_HEADER_SIZE 30

static CURL *curl;
static struct curl_slist *no_pragma_header;
static struct curl_slist *no_range_header;
static char curl_errorstr[CURL_ERROR_SIZE];

static char *initial_base;

struct alt_base
{
char *base;
int got_indices;
struct packed_git *packs;
struct alt_base *next;
};

static struct alt_base *alt = NULL;

static SHA_CTX c;
static z_stream stream;

static int local;
static int zret;

static int curl_ssl_verify;
static char *ssl_cert;
static char *ssl_key;
static char *ssl_capath;
static char *ssl_cainfo;

struct buffer
{
        size_t posn;
        size_t size;
        void *buffer;
};

static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
                            struct buffer *buffer)
{
        size_t size = eltsize * nmemb;
        if (size > buffer->size - buffer->posn)
                size = buffer->size - buffer->posn;
        memcpy(buffer->buffer + buffer->posn, ptr, size);
        buffer->posn += size;
        return size;
}

static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
void *data)
{
unsigned char expn[4096];
size_t size = eltsize * nmemb;
int posn = 0;
do {
ssize_t retval = write(local, ptr + posn, size - posn);
if (retval < 0)
return posn;
posn += retval;
} while (posn < size);

stream.avail_in = size;
stream.next_in = ptr;
do {
stream.next_out = expn;
stream.avail_out = sizeof(expn);
zret = inflate(&stream, Z_SYNC_FLUSH);
SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
} while (stream.avail_in && zret == Z_OK);
return size;
}

void prefetch(unsigned char *sha1)
{
}

int relink_or_rename(char *old, char *new) {
int ret;

ret = link(old, new);
if (ret < 0) {
/* Same Coda hack as in write_sha1_file(sha1_file.c) */
ret = errno;
if (ret == EXDEV && !rename(old, new))
return 0;
}
unlink(old);
if (ret) {
if (ret != EEXIST)
return ret;
}

return 0;
}

static int got_alternates = 0;

static int fetch_index(struct alt_base *repo, unsigned char *sha1)
{
char *filename;
char *url;
char tmpfile[PATH_MAX];
int ret;
long prev_posn = 0;
char range[RANGE_HEADER_SIZE];
struct curl_slist *range_header = NULL;
CURLcode curl_result;

FILE *indexfile;

if (has_pack_index(sha1))
return 0;

if (get_verbosely)
fprintf(stderr, "Getting index for pack %s\n",
sha1_to_hex(sha1));

url = xmalloc(strlen(repo->base) + 64);
sprintf(url, "%s/objects/pack/pack-%s.idx",
repo->base, sha1_to_hex(sha1));

filename = sha1_pack_index_name(sha1);
snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
indexfile = fopen(tmpfile, "a");
if (!indexfile)
return error("Unable to open local file %s for pack index",
filename);

curl_easy_setopt(curl, CURLOPT_FILE, indexfile);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);

/* If there is data present from a previous transfer attempt,
resume where it left off */
prev_posn = ftell(indexfile);
if (prev_posn>0) {
if (get_verbosely)
fprintf(stderr,
"Resuming fetch of index for pack %s at byte %ld\n",
sha1_to_hex(sha1), prev_posn);
sprintf(range, "Range: bytes=%ld-", prev_posn);
range_header = curl_slist_append(range_header, range);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, range_header);
}

/* Clear out the Range: header after performing the request, so
other curl requests don't inherit inappropriate header data */
curl_result = curl_easy_perform(curl);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_range_header);
if (curl_result != 0) {
fclose(indexfile);
return error("Unable to get pack index %s\n%s", url,
curl_errorstr);
}

fclose(indexfile);

ret = relink_or_rename(tmpfile, filename);
if (ret)
return error("unable to write index filename %s: %s",
filename, strerror(ret));

return 0;
}

static int setup_index(struct alt_base *repo, unsigned char *sha1)
{
struct packed_git *new_pack;
if (has_pack_file(sha1))
return 0; // don't list this as something we can get

if (fetch_index(repo, sha1))
return -1;

new_pack = parse_pack_index(sha1);
new_pack->next = repo->packs;
repo->packs = new_pack;
return 0;
}

static int fetch_alternates(char *base)
{
int ret = 0;
struct buffer buffer;
char *url;
char *data;
int i = 0;
int http_specific = 1;
if (got_alternates)
return 0;
data = xmalloc(4096);
buffer.size = 4095;
buffer.posn = 0;
buffer.buffer = data;

if (get_verbosely)
fprintf(stderr, "Getting alternates list\n");

url = xmalloc(strlen(base) + 31);
sprintf(url, "%s/objects/info/http-alternates", base);

curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(curl, CURLOPT_URL, url);

if (curl_easy_perform(curl) || !buffer.posn) {
http_specific = 0;

sprintf(url, "%s/objects/info/alternates", base);

curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(curl, CURLOPT_URL, url);

if (curl_easy_perform(curl)) {
return 0;
}
}

data[buffer.posn] = '\0';

while (i < buffer.posn) {
int posn = i;
while (posn < buffer.posn && data[posn] != '\n')
posn++;
if (data[posn] == '\n') {
int okay = 0;
int serverlen = 0;
struct alt_base *newalt;
char *target = NULL;
if (data[i] == '/') {
serverlen = strchr(base + 8, '/') - base;
okay = 1;
} else if (!memcmp(data + i, "../", 3)) {
i += 3;
serverlen = strlen(base);
while (i + 2 < posn &&
!memcmp(data + i, "../", 3)) {
do {
serverlen--;
} while (serverlen &&
base[serverlen - 1] != '/');
i += 3;
}
// If the server got removed, give up.
okay = strchr(base, ':') - base + 3 <
serverlen;
} else if (http_specific) {
char *colon = strchr(data + i, ':');
char *slash = strchr(data + i, '/');
if (colon && slash && colon < data + posn &&
slash < data + posn && colon < slash) {
okay = 1;
}
}
// skip 'objects' at end
if (okay) {
target = xmalloc(serverlen + posn - i - 6);
strncpy(target, base, serverlen);
strncpy(target + serverlen, data + i,
posn - i - 7);
target[serverlen + posn - i - 7] = '\0';
if (get_verbosely)
fprintf(stderr,
"Also look at %s\n", target);
newalt = xmalloc(sizeof(*newalt));
newalt->next = alt;
newalt->base = target;
newalt->got_indices = 0;
newalt->packs = NULL;
alt = newalt;
ret++;
}
}
i = posn + 1;
}
got_alternates = 1;

return ret;
}

static int fetch_indices(struct alt_base *repo)
{
unsigned char sha1[20];
char *url;
struct buffer buffer;
char *data;
int i = 0;

if (repo->got_indices)
return 0;

data = xmalloc(4096);
buffer.size = 4096;
buffer.posn = 0;
buffer.buffer = data;

if (get_verbosely)
fprintf(stderr, "Getting pack list\n");

url = xmalloc(strlen(repo->base) + 21);
sprintf(url, "%s/objects/info/packs", repo->base);

curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);

if (curl_easy_perform(curl))
return error("%s", curl_errorstr);

while (i < buffer.posn) {
switch (data[i]) {
case 'P':
i++;
if (i + 52 < buffer.posn &&
!strncmp(data + i, " pack-", 6) &&
!strncmp(data + i + 46, ".pack\n", 6)) {
get_sha1_hex(data + i + 6, sha1);
setup_index(repo, sha1);
i += 51;
break;
}
default:
while (data[i] != '\n')
i++;
}
i++;
}

repo->got_indices = 1;
return 0;
}

static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
{
char *url;
struct packed_git *target;
struct packed_git **lst;
FILE *packfile;
char *filename;
char tmpfile[PATH_MAX];
int ret;
long prev_posn = 0;
char range[RANGE_HEADER_SIZE];
struct curl_slist *range_header = NULL;
CURLcode curl_result;

if (fetch_indices(repo))
return -1;
target = find_sha1_pack(sha1, repo->packs);
if (!target)
return -1;

if (get_verbosely) {
fprintf(stderr, "Getting pack %s\n",
sha1_to_hex(target->sha1));
fprintf(stderr, " which contains %s\n",
sha1_to_hex(sha1));
}

url = xmalloc(strlen(repo->base) + 65);
sprintf(url, "%s/objects/pack/pack-%s.pack",
repo->base, sha1_to_hex(target->sha1));

filename = sha1_pack_name(target->sha1);
snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
packfile = fopen(tmpfile, "a");
if (!packfile)
return error("Unable to open local file %s for pack",
filename);

curl_easy_setopt(curl, CURLOPT_FILE, packfile);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);

/* If there is data present from a previous transfer attempt,
resume where it left off */
prev_posn = ftell(packfile);
if (prev_posn>0) {
if (get_verbosely)
fprintf(stderr,
"Resuming fetch of pack %s at byte %ld\n",
sha1_to_hex(target->sha1), prev_posn);
sprintf(range, "Range: bytes=%ld-", prev_posn);
range_header = curl_slist_append(range_header, range);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, range_header);
}

/* Clear out the Range: header after performing the request, so
other curl requests don't inherit inappropriate header data */
curl_result = curl_easy_perform(curl);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_range_header);
if (curl_result != 0) {
fclose(packfile);
return error("Unable to get pack file %s\n%s", url,
curl_errorstr);
}

fclose(packfile);

ret = relink_or_rename(tmpfile, filename);
if (ret)
return error("unable to write pack filename %s: %s",
filename, strerror(ret));

lst = &repo->packs;
while (*lst != target)
lst = &((*lst)->next);
*lst = (*lst)->next;

if (verify_pack(target, 0))
return -1;
install_packed_git(target);

return 0;
}

static int fetch_object(struct alt_base *repo, unsigned char *sha1)
{
char *hex = sha1_to_hex(sha1);
char *filename = sha1_file_name(sha1);
unsigned char real_sha1[20];
char tmpfile[PATH_MAX];
char prevfile[PATH_MAX];
int ret;
char *url;
char *posn;
int prevlocal;
unsigned char prev_buf[PREV_BUF_SIZE];
ssize_t prev_read = 0;
long prev_posn = 0;
char range[RANGE_HEADER_SIZE];
struct curl_slist *range_header = NULL;
CURLcode curl_result;

snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);

if (unlink(prevfile) && (errno != ENOENT))
return error("Failed to unlink %s (%s)",
prevfile, strerror(errno));
if (rename(tmpfile, prevfile) && (errno != ENOENT))
return error("Failed to rename %s to %s (%s)",
tmpfile, prevfile, strerror(errno));

local = open(tmpfile, O_WRONLY | O_CREAT | O_EXCL, 0666);

/* Note: if another instance starts now, it will turn our new
tmpfile into its prevfile. */

if (local < 0)
return error("Couldn't create temporary file %s for %s: %s\n",
tmpfile, filename, strerror(errno));

memset(&stream, 0, sizeof(stream));

inflateInit(&stream);

SHA1_Init(&c);

curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
curl_easy_setopt(curl, CURLOPT_FILE, NULL);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);

url = xmalloc(strlen(repo->base) + 50);
strcpy(url, repo->base);
posn = url + strlen(repo->base);
strcpy(posn, "objects/");
posn += 8;
memcpy(posn, hex, 2);
posn += 2;
*(posn++) = '/';
strcpy(posn, hex + 2);

curl_easy_setopt(curl, CURLOPT_URL, url);

/* If a previous temp file is present, process what was already
fetched. */
prevlocal = open(prevfile, O_RDONLY);
if (prevlocal != -1) {
do {
prev_read = read(prevlocal, prev_buf, PREV_BUF_SIZE);
if (prev_read>0) {
if (fwrite_sha1_file(prev_buf,
1,
prev_read,
NULL) == prev_read) {
prev_posn += prev_read;
} else {
prev_read = -1;
}
}
} while (prev_read > 0);
close(prevlocal);
}
unlink(prevfile);

/* Reset inflate/SHA1 if there was an error reading the previous temp
file; also rewind to the beginning of the local file. */
if (prev_read == -1) {
memset(&stream, 0, sizeof(stream));
inflateInit(&stream);
SHA1_Init(&c);
if (prev_posn>0) {
prev_posn = 0;
lseek(local, SEEK_SET, 0);
ftruncate(local, 0);
}
}

/* If we have successfully processed data from a previous fetch
attempt, only fetch the data we don't already have. */
if (prev_posn>0) {
if (get_verbosely)
fprintf(stderr,
"Resuming fetch of object %s at byte %ld\n",
hex, prev_posn);
sprintf(range, "Range: bytes=%ld-", prev_posn);
range_header = curl_slist_append(range_header, range);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, range_header);
}

/* Clear out the Range: header after performing the request, so
other curl requests don't inherit inappropriate header data */
curl_result = curl_easy_perform(curl);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_range_header);
if (curl_result != 0) {
return error("%s", curl_errorstr);
}

fchmod(local, 0444);
close(local);
inflateEnd(&stream);
SHA1_Final(real_sha1, &c);
if (zret != Z_STREAM_END) {
unlink(tmpfile);
return error("File %s (%s) corrupt\n", hex, url);
}
if (memcmp(sha1, real_sha1, 20)) {
unlink(tmpfile);
return error("File %s has bad hash\n", hex);
}
ret = relink_or_rename(tmpfile, filename);
if (ret)
return error("unable to write sha1 filename %s: %s",
filename, strerror(ret));

pull_say("got %s\n", hex);
return 0;
}

int fetch(unsigned char *sha1)
{
struct alt_base *altbase = alt;
while (altbase) {
if (!fetch_object(altbase, sha1))
return 0;
if (!fetch_pack(altbase, sha1))
return 0;
if (fetch_alternates(altbase->base) > 0) {
altbase = alt;
continue;
}
altbase = altbase->next;
}
return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
initial_base);
}

int fetch_ref(char *ref, unsigned char *sha1)
{
        char *url, *posn;
        char hex[42];
        struct buffer buffer;
char *base = initial_base;
        buffer.size = 41;
        buffer.posn = 0;
        buffer.buffer = hex;
        hex[41] = '\0';
        
        curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);

        url = xmalloc(strlen(base) + 6 + strlen(ref));
        strcpy(url, base);
        posn = url + strlen(base);
        strcpy(posn, "refs/");
        posn += 5;
        strcpy(posn, ref);

        curl_easy_setopt(curl, CURLOPT_URL, url);

        if (curl_easy_perform(curl))
                return error("Couldn't get %s for %s\n%s",
url, ref, curl_errorstr);

        hex[40] = '\0';
        get_sha1_hex(hex, sha1);
        return 0;
}

int main(int argc, char **argv)
{
char *commit_id;
char *url;
int arg = 1;

while (arg < argc && argv[arg][0] == '-') {
if (argv[arg][1] == 't') {
get_tree = 1;
} else if (argv[arg][1] == 'c') {
get_history = 1;
} else if (argv[arg][1] == 'a') {
get_all = 1;
get_tree = 1;
get_history = 1;
} else if (argv[arg][1] == 'v') {
get_verbosely = 1;
} else if (argv[arg][1] == 'w') {
write_ref = argv[arg + 1];
arg++;
} else if (!strcmp(argv[arg], "--recover")) {
get_recover = 1;
}
arg++;
}
if (argc < arg + 2) {
usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
return 1;
}
commit_id = argv[arg];
url = argv[arg + 1];

curl_global_init(CURL_GLOBAL_ALL);

curl = curl_easy_init();
no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
no_range_header = curl_slist_append(no_range_header, "Range:");

curl_ssl_verify = getenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
#if LIBCURL_VERSION_NUM >= 0x070907
curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
#endif

if ((ssl_cert = getenv("GIT_SSL_CERT")) != NULL) {
curl_easy_setopt(curl, CURLOPT_SSLCERT, ssl_cert);
}
#if LIBCURL_VERSION_NUM >= 0x070902
if ((ssl_key = getenv("GIT_SSL_KEY")) != NULL) {
curl_easy_setopt(curl, CURLOPT_SSLKEY, ssl_key);
}
#endif
#if LIBCURL_VERSION_NUM >= 0x070908
if ((ssl_capath = getenv("GIT_SSL_CAPATH")) != NULL) {
curl_easy_setopt(curl, CURLOPT_CAPATH, ssl_capath);
}
#endif
if ((ssl_cainfo = getenv("GIT_SSL_CAINFO")) != NULL) {
curl_easy_setopt(curl, CURLOPT_CAINFO, ssl_cainfo);
}

alt = xmalloc(sizeof(*alt));
alt->base = url;
alt->got_indices = 0;
alt->packs = NULL;
alt->next = NULL;
initial_base = url;

if (pull(commit_id))
return 1;

curl_slist_free_all(no_pragma_header);
curl_global_cleanup();
return 0;
}
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