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#include "fallback.h"
#include "fileutils.h"
#include "../depends/cJSON.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
bool fallback_load_from_file(fallback *self, const char *filepath) {
memset(self, 0, sizeof(*self));
char *file_data;
long file_size;
if(file_get_content(filepath, &file_data, &file_size) != 0) {
fprintf(stderr, "Error: fallback_load_from_file: failed to read %s\n", filepath);
return false;
}
cJSON *json_root = cJSON_ParseWithLength(file_data, file_size);
if(!json_root) {
fprintf(stderr, "Error: fallback_load_from_file: failed to parse file %s as json\n", filepath);
goto error;
}
free(file_data);
file_data = NULL;
if(!cJSON_IsArray(json_root)) {
fprintf(stderr, "File %s contains malformed json. Expected json root element to be an array\n", filepath);
goto error;
}
buffer_init(&self->fallbacks);
const cJSON *fallback_item_json = NULL;
cJSON_ArrayForEach(fallback_item_json, json_root) {
if(!cJSON_IsObject(fallback_item_json))
continue;
const cJSON *source_json = cJSON_GetObjectItemCaseSensitive(fallback_item_json, "source");
if(!cJSON_IsString(source_json))
continue;
const cJSON *fallbacks_json = cJSON_GetObjectItemCaseSensitive(fallback_item_json, "fallbacks");
if(!cJSON_IsArray(fallbacks_json))
continue;
char *source_str = strdup(source_json->valuestring);
if(!source_str) {
fprintf(stderr, "Error: failed to clone string: %s\n", source_str);
abort();
}
fallback_item item;
item.source = source_str;
item.source_to_use = NULL;
buffer_init(&item.fallbacks);
const cJSON *fallback_str_json = NULL;
cJSON_ArrayForEach(fallback_str_json, fallbacks_json) {
if(!cJSON_IsString(fallback_str_json))
continue;
char *fallback = strdup(fallback_str_json->valuestring);
if(!fallback) {
fprintf(stderr, "Error: failed to clone string: %s\n", fallback);
abort();
}
buffer_append(&item.fallbacks, &fallback, sizeof(fallback));
}
buffer_append(&self->fallbacks, &item, sizeof(item));
}
cJSON_Delete(json_root);
free(file_data);
return true;
error:
cJSON_Delete(json_root);
free(file_data);
return false;
}
void fallback_deinit(fallback *self) {
fallback_item *items_it = buffer_begin(&self->fallbacks);
fallback_item *items_end = buffer_end(&self->fallbacks);
for(; items_it != items_end; ++items_it) {
if(items_it->source) {
free(items_it->source);
items_it->source = NULL;
}
char **fallbacks_it = buffer_begin(&items_it->fallbacks);
char **fallbacks_end = buffer_end(&items_it->fallbacks);
for(; fallbacks_it != fallbacks_end; ++fallbacks_it) {
if(*fallbacks_it) {
free(*fallbacks_it);
*fallbacks_it = NULL;
}
}
buffer_deinit(&items_it->fallbacks);
}
buffer_deinit(&self->fallbacks);
}
static void url_extract_domain(const char **url, int *len) {
if(*len >= 7 && strncmp("http://", *url, 7) == 0) {
*url += 7;
*len -= 7;
} else if(*len >= 8 && strncmp("https://", *url, 8) == 0) {
*url += 8;
*len -= 8;
}
const char *end = strchr(*url, '/');
if(end)
*len = end - *url;
}
fallback_item* fallback_get_from_url(fallback *self, const char *url) {
int url_len = strlen(url);
url_extract_domain(&url, &url_len);
fallback_item *items_it = buffer_begin(&self->fallbacks);
fallback_item *items_end = buffer_end(&self->fallbacks);
for(; items_it != items_end; ++items_it) {
int source_len = strlen(items_it->source);
const char *source = items_it->source;
url_extract_domain(&source, &source_len);
if(url_len == source_len && memcmp(url, source, url_len) == 0)
return items_it;
if(!items_it->source_to_use)
continue;
int source_to_use_len = strlen(items_it->source_to_use);
const char *source_to_use = items_it->source_to_use;
url_extract_domain(&source_to_use, &source_to_use_len);
if(url_len == source_to_use_len && memcmp(url, source_to_use, url_len) == 0)
return items_it;
}
return NULL;
}
void fallback_clear_sources_to_use(fallback *self) {
fallback_item *items_it = buffer_begin(&self->fallbacks);
fallback_item *items_end = buffer_end(&self->fallbacks);
for(; items_it != items_end; ++items_it) {
items_it->source_to_use = NULL;
}
}
static const char* get_url_part_after_domain(const char *url) {
int len = strlen(url);
if(len >= 7 && strncmp(url, "http://", 7) == 0) {
url += 7;
len -= 7;
} else if(len >= 8 && strncmp(url, "https://", 8) == 0) {
url += 8;
len -= 8;
}
const char *after_domain = strchr(url, '/');
if(after_domain)
return after_domain;
else
return url + len;
}
void fallback_replace_url_with_fallback_url(const char *url, const char *fallback_url, char *new_url, size_t new_url_len) {
const char *url_part_after_domain = get_url_part_after_domain(url);
snprintf(new_url, new_url_len, "%s%s", fallback_url, url_part_after_domain);
}
void fallback_replace_active_fallback_url_with_source_url(fallback *self, const char *url, char *new_url, size_t new_url_len) {
fallback_item *fall_item = fallback_get_from_url(self, url);
if(!fall_item || !fall_item->source_to_use) {
snprintf(new_url, new_url_len, "%s", url);
return;
}
fallback_replace_url_with_fallback_url(url, fall_item->source, new_url, new_url_len);
}
void fallback_item_replace_url_with_fallback_url(fallback_item *self, const char *url, char *new_url, size_t new_url_len) {
if(!self->source_to_use) {
snprintf(new_url, new_url_len, "%s", url);
return;
}
fallback_replace_url_with_fallback_url(url, self->source_to_use, new_url, new_url_len);
}
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