| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. |
| * |
| * This software is licensed as described in the file COPYING, which |
| * you should have received as part of this distribution. The terms |
| * are also available at https://curl.se/docs/copyright.html. |
| * |
| * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
| * copies of the Software, and permit persons to whom the Software is |
| * furnished to do so, under the terms of the COPYING file. |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| * KIND, either express or implied. |
| * |
| * SPDX-License-Identifier: curl |
| * |
| ***************************************************************************/ |
| #include "tool_setup.h" |
| |
| #define ENABLE_CURLX_PRINTF |
| /* use our own printf() functions */ |
| #include "curlx.h" |
| #include "dynbuf.h" |
| |
| #include "tool_cfgable.h" |
| #include "tool_msgs.h" |
| #include "tool_ipfs.h" |
| |
| #include "memdebug.h" /* keep this as LAST include */ |
| |
| /* ensure input ends in slash */ |
| static CURLcode ensure_trailing_slash(char **input) |
| { |
| if(*input && **input) { |
| size_t len = strlen(*input); |
| if(((*input)[len - 1] != '/')) { |
| struct curlx_dynbuf dyn; |
| curlx_dyn_init(&dyn, len + 2); |
| |
| if(curlx_dyn_addn(&dyn, *input, len)) { |
| Curl_safefree(*input); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| |
| Curl_safefree(*input); |
| |
| if(curlx_dyn_addn(&dyn, "/", 1)) |
| return CURLE_OUT_OF_MEMORY; |
| |
| *input = curlx_dyn_ptr(&dyn); |
| } |
| } |
| |
| return CURLE_OK; |
| } |
| |
| static char *ipfs_gateway(void) |
| { |
| char *ipfs_path = NULL; |
| char *gateway_composed_file_path = NULL; |
| FILE *gateway_file = NULL; |
| char *gateway = curl_getenv("IPFS_GATEWAY"); |
| |
| /* Gateway is found from environment variable. */ |
| if(gateway) { |
| if(ensure_trailing_slash(&gateway)) |
| goto fail; |
| return gateway; |
| } |
| |
| /* Try to find the gateway in the IPFS data folder. */ |
| ipfs_path = curl_getenv("IPFS_PATH"); |
| |
| if(!ipfs_path) { |
| char *home = getenv("HOME"); |
| if(home && *home) |
| ipfs_path = aprintf("%s/.ipfs/", home); |
| /* fallback to "~/.ipfs", as that's the default location. */ |
| } |
| |
| if(!ipfs_path || ensure_trailing_slash(&ipfs_path)) |
| goto fail; |
| |
| gateway_composed_file_path = aprintf("%sgateway", ipfs_path); |
| |
| if(!gateway_composed_file_path) |
| goto fail; |
| |
| gateway_file = fopen(gateway_composed_file_path, FOPEN_READTEXT); |
| Curl_safefree(gateway_composed_file_path); |
| |
| if(gateway_file) { |
| int c; |
| struct curlx_dynbuf dyn; |
| curlx_dyn_init(&dyn, MAX_GATEWAY_URL_LEN); |
| |
| /* get the first line of the gateway file, ignore the rest */ |
| while((c = getc(gateway_file)) != EOF && c != '\n' && c != '\r') { |
| char c_char = (char)c; |
| if(curlx_dyn_addn(&dyn, &c_char, 1)) |
| goto fail; |
| } |
| |
| fclose(gateway_file); |
| gateway_file = NULL; |
| |
| if(curlx_dyn_len(&dyn)) |
| gateway = curlx_dyn_ptr(&dyn); |
| |
| if(gateway) |
| ensure_trailing_slash(&gateway); |
| |
| if(!gateway) |
| goto fail; |
| |
| Curl_safefree(ipfs_path); |
| |
| return gateway; |
| } |
| fail: |
| if(gateway_file) |
| fclose(gateway_file); |
| Curl_safefree(gateway); |
| Curl_safefree(ipfs_path); |
| return NULL; |
| } |
| |
| /* |
| * Rewrite ipfs://<cid> and ipns://<cid> to a HTTP(S) |
| * URL that can be handled by an IPFS gateway. |
| */ |
| CURLcode ipfs_url_rewrite(CURLU *uh, const char *protocol, char **url, |
| struct OperationConfig *config) |
| { |
| CURLcode result = CURLE_URL_MALFORMAT; |
| CURLUcode getResult; |
| char *gateway = NULL; |
| char *gwhost = NULL; |
| char *gwpath = NULL; |
| char *gwquery = NULL; |
| char *gwscheme = NULL; |
| char *gwport = NULL; |
| char *inputpath = NULL; |
| char *cid = NULL; |
| char *pathbuffer = NULL; |
| char *cloneurl; |
| CURLU *gatewayurl = curl_url(); |
| |
| if(!gatewayurl) { |
| result = CURLE_FAILED_INIT; |
| goto clean; |
| } |
| |
| getResult = curl_url_get(uh, CURLUPART_HOST, &cid, CURLU_URLDECODE); |
| if(getResult || !cid) |
| goto clean; |
| |
| /* We might have a --ipfs-gateway argument. Check it first and use it. Error |
| * if we do have something but if it's an invalid url. |
| */ |
| if(config->ipfs_gateway) { |
| /* ensure the gateway ends in a trailing / */ |
| if(ensure_trailing_slash(&config->ipfs_gateway) != CURLE_OK) { |
| result = CURLE_OUT_OF_MEMORY; |
| goto clean; |
| } |
| |
| if(!curl_url_set(gatewayurl, CURLUPART_URL, config->ipfs_gateway, |
| CURLU_GUESS_SCHEME)) { |
| gateway = strdup(config->ipfs_gateway); |
| if(!gateway) { |
| result = CURLE_URL_MALFORMAT; |
| goto clean; |
| } |
| |
| } |
| else { |
| result = CURLE_BAD_FUNCTION_ARGUMENT; |
| goto clean; |
| } |
| } |
| else { |
| /* this is ensured to end in a trailing / within ipfs_gateway() */ |
| gateway = ipfs_gateway(); |
| if(!gateway) { |
| result = CURLE_FILE_COULDNT_READ_FILE; |
| goto clean; |
| } |
| |
| if(curl_url_set(gatewayurl, CURLUPART_URL, gateway, 0)) { |
| result = CURLE_URL_MALFORMAT; |
| goto clean; |
| } |
| } |
| |
| /* check for unsupported gateway parts */ |
| if(curl_url_get(gatewayurl, CURLUPART_QUERY, &gwquery, 0) |
| != CURLUE_NO_QUERY) { |
| result = CURLE_URL_MALFORMAT; |
| goto clean; |
| } |
| |
| /* get gateway parts */ |
| if(curl_url_get(gatewayurl, CURLUPART_HOST, |
| &gwhost, CURLU_URLDECODE)) { |
| goto clean; |
| } |
| |
| if(curl_url_get(gatewayurl, CURLUPART_SCHEME, |
| &gwscheme, CURLU_URLDECODE)) { |
| goto clean; |
| } |
| |
| curl_url_get(gatewayurl, CURLUPART_PORT, &gwport, CURLU_URLDECODE); |
| curl_url_get(gatewayurl, CURLUPART_PATH, &gwpath, CURLU_URLDECODE); |
| |
| /* get the path from user input */ |
| curl_url_get(uh, CURLUPART_PATH, &inputpath, CURLU_URLDECODE); |
| /* inputpath might be NULL or a valid pointer now */ |
| |
| /* set gateway parts in input url */ |
| if(curl_url_set(uh, CURLUPART_SCHEME, gwscheme, CURLU_URLENCODE) || |
| curl_url_set(uh, CURLUPART_HOST, gwhost, CURLU_URLENCODE) || |
| curl_url_set(uh, CURLUPART_PORT, gwport, CURLU_URLENCODE)) |
| goto clean; |
| |
| /* if the input path is just a slash, clear it */ |
| if(inputpath && (inputpath[0] == '/') && !inputpath[1]) |
| *inputpath = '\0'; |
| |
| /* ensure the gateway path ends with a trailing slash */ |
| ensure_trailing_slash(&gwpath); |
| |
| pathbuffer = aprintf("%s%s/%s%s", gwpath, protocol, cid, |
| inputpath ? inputpath : ""); |
| if(!pathbuffer) { |
| goto clean; |
| } |
| |
| if(curl_url_set(uh, CURLUPART_PATH, pathbuffer, CURLU_URLENCODE)) { |
| goto clean; |
| } |
| |
| /* Free whatever it has now, rewriting is next */ |
| Curl_safefree(*url); |
| |
| if(curl_url_get(uh, CURLUPART_URL, &cloneurl, CURLU_URLENCODE)) { |
| goto clean; |
| } |
| /* we need to strdup the URL so that we can call free() on it later */ |
| *url = strdup(cloneurl); |
| curl_free(cloneurl); |
| if(!*url) |
| goto clean; |
| |
| result = CURLE_OK; |
| |
| clean: |
| free(gateway); |
| curl_free(gwhost); |
| curl_free(gwpath); |
| curl_free(gwquery); |
| curl_free(inputpath); |
| curl_free(gwscheme); |
| curl_free(gwport); |
| curl_free(cid); |
| curl_free(pathbuffer); |
| curl_url_cleanup(gatewayurl); |
| { |
| switch(result) { |
| case CURLE_URL_MALFORMAT: |
| helpf(tool_stderr, "malformed target URL"); |
| break; |
| case CURLE_FILE_COULDNT_READ_FILE: |
| helpf(tool_stderr, "IPFS automatic gateway detection failed"); |
| break; |
| case CURLE_BAD_FUNCTION_ARGUMENT: |
| helpf(tool_stderr, "--ipfs-gateway was given a malformed URL"); |
| break; |
| default: |
| break; |
| } |
| } |
| return result; |
| } |