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/*
* Copyright (C) 2016 Robin Krahl <robin.krahl@ireas.org>
*
* dbfp.c
*/
#include "dbfp.h"
#include <curl/curl.h>
#include <errno.h>
#include <expat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define DBFP_BASE_URL "http://open-api.bahn.de/bin/rest.exe"
#define DBFP_URL_FORMAT "%s/%s?authKey=%s&%s"
#define DBFP_URL_LEN 8000
struct parse_data {
struct dbfp_status *status;
void *data;
};
struct loc_data {
size_t n;
struct dbfp_location *locs;
};
static int dbfp_parse(void *contents, size_t len, size_t n, void *data);
static void dbfp_request(struct dbfp *dbfp, char *service, char *query,
XML_Parser parser, struct dbfp_status *status);
static int dbfp_url(struct dbfp *dbfp, char *service, char *query, char **url);
static void handle_loc(struct loc_data *ld, const char **atts);
static void loc_ele_start(void *data, const char *name, const char **atts);
static void loc_ele_end(void *data, const char *name);
int dbfp_init(struct dbfp *dbfp, char *key)
{
if (!dbfp || !key)
return EINVAL;
dbfp->key = strdup(key);
if (!dbfp->key)
return ENOMEM;
curl_global_init(CURL_GLOBAL_ALL ^ CURL_GLOBAL_SSL);
return 0;
}
void dbfp_close(struct dbfp *dbfp)
{
if (!dbfp)
return;
curl_global_cleanup();
free(dbfp->key);
}
struct dbfp_status dbfp_query_location_name(struct dbfp *dbfp, char *input,
size_t *n, struct dbfp_location **out)
{
struct dbfp_status status = { 0, 0, 0, 0, 0 };
char *query = NULL;
int len;
struct parse_data pd;
struct loc_data ld;
XML_Parser parser = NULL;
if (!dbfp || !input) {
status.error = 1;
status.run_error = EINVAL;
goto cleanup;
}
/*
* TODO(robin.krahl): improve query building and implement HTML
* encoding.
*/
query = malloc(DBFP_URL_LEN);
if (!query) {
status.error = 1;
status.run_error = ENOMEM;
goto cleanup;
}
len = snprintf(query, DBFP_URL_LEN, "input=%s", input);
if (len < 0 || len >= DBFP_URL_LEN) {
status.error = 1;
status.run_error = -1;
goto cleanup;
}
pd.status = &status;
pd.data = &ld;
ld.n = 0;
ld.locs = NULL;
parser = XML_ParserCreateNS(NULL, '\0');
XML_SetUserData(parser, &pd);
XML_SetElementHandler(parser, loc_ele_start, loc_ele_end);
dbfp_request(dbfp, "location.name", query, parser, &status);
if (!status.error) {
if (n)
*n = ld.n;
if (out)
*out = ld.locs;
else
free(ld.locs);
} else {
free(ld.locs);
}
cleanup:
XML_ParserFree(parser);
free(query);
return status;
}
static int dbfp_parse(void *contents, size_t len, size_t n, void *data)
{
XML_Parser parser = (XML_Parser)data;
struct parse_data *pd;
size_t size = len * n;
pd = (struct parse_data *)XML_GetUserData(parser);
if (!pd->status->parse_error && !XML_Parse(parser, contents, size, 0)) {
pd->status->error = 1;
pd->status->parse_error = XML_GetErrorCode(parser);
}
return size;
}
static void dbfp_request(struct dbfp *dbfp, char *service, char *query,
XML_Parser parser, struct dbfp_status *status)
{
char *url;
CURL *curl = NULL;
status->run_error = dbfp_url(dbfp, service, query, &url);
if (status->run_error)
goto cleanup;
curl = curl_easy_init();
if (!curl) {
status->error = 1;
status->run_error = -1;
goto cleanup;
}
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, dbfp_parse);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)parser);
status->curl_error = curl_easy_perform(curl);
if (status->parse_error)
fprintf(stderr, "Parse error %d: %s\n", status->parse_error,
XML_ErrorString(status->parse_error));
cleanup:
if (curl)
curl_easy_cleanup(curl);
free(url);
}
static int dbfp_url(struct dbfp *dbfp, char *service, char *query, char **url)
{
int len;
*url = malloc(DBFP_URL_LEN);
if (!*url)
return ENOMEM;
len = snprintf(*url, DBFP_URL_LEN, DBFP_URL_FORMAT, DBFP_BASE_URL,
service, dbfp->key, query);
if (len < 0 || len >= DBFP_URL_LEN) {
free(*url);
*url = NULL;
return -1;
}
return 0;
}
static void handle_loc(struct loc_data *ld, const char **atts)
{
char *name = NULL;
char *id = NULL;
size_t i;
/*
* TODO(robin.krahl): fix error handling for the cases that a)
* name or id is not set and b) realloc fails.
*/
for (i = 0; atts[i]; i += 2) {
if (strcmp(atts[i], "name") == 0)
name = strdup(atts[i + 1]);
else if (strcmp(atts[i], "id") == 0)
id = strdup(atts[i + 1]);
}
if (name && id) {
ld->locs = realloc(ld->locs, (ld->n + 1) * sizeof(*ld->locs));
if (ld->locs) {
ld->n++;
ld->locs[ld->n - 1].name = name;
ld->locs[ld->n - 1].id = id;
}
} else {
free(name);
free(id);
}
}
static void loc_ele_start(void *data, const char *name, const char **atts)
{
struct parse_data *pd = (struct parse_data *)data;
struct loc_data *ld = (struct loc_data *)pd->data;
size_t i;
if (strcmp(name, "Error") == 0) {
for (i = 0; atts[i]; i += 2) {
if (strcmp(atts[i], "code")) {
fprintf(stderr, "err code %s\n", atts[i + 1]);
break;
}
}
} else if (strcmp(name, "StopLocation") == 0) {
handle_loc(ld, atts);
}
}
static void loc_ele_end(void *data, const char *name)
{
}
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