mirror of
https://github.com/HamletDuFromage/aio-switch-updater.git
synced 2024-11-28 20:32:06 +00:00
Allow downloads from Mega
This commit is contained in:
Angelo Elias Dalzotto
parent
ddee32ba66
commit
39cdc2b037
1 changed files with 176 additions and 5 deletions
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@ -4,6 +4,7 @@
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#include <math.h>
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#include <switch.h>
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#include <time.h>
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#include <mbedtls/base64.h>
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#include <algorithm>
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#include <chrono>
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@ -41,6 +42,7 @@ namespace download {
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size_t data_size;
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u_int64_t offset;
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FILE* out;
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Aes128CtrContext* aes;
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} ntwrk_struct_t;
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static size_t WriteMemoryCallback(void* contents, size_t size, size_t num_files, void* userp)
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@ -56,7 +58,11 @@ namespace download {
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data_struct->offset = 0;
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}
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if(data_struct->aes)
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aes128CtrCrypt(data_struct->aes, &data_struct->data[data_struct->offset], contents, realsize);
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else
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memcpy(&data_struct->data[data_struct->offset], contents, realsize);
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data_struct->offset += realsize;
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data_struct->data[data_struct->offset] = 0;
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return realsize;
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@ -125,6 +131,159 @@ namespace download {
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}
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return true;
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}
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std::string mega_id(std::string url)
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{
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auto len = url.length();
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if(len < 52)
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throw std::invalid_argument("Invalid URL.");
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bool old_link = url.find("#!") < len;
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/* Start from the last '/' and add 2 characters if old link format starting with '#!' */
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auto init_pos = url.find_last_of('/') + (old_link ? 2 : 0) + 1;
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/* End with the last '#' or "!" if its the old link format */
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auto end_pos = url.find_last_of(old_link ? '!' : '#');
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/* Finally crop the url */
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std::string id = url.substr(init_pos, end_pos - init_pos);
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if(id.length() != 8)
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throw std::invalid_argument("Invalid URL ID.");
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return id;
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}
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std::string mega_url(std::string url)
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{
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std::string id = mega_id(url);
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json request = json::array({
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{
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{"a", "g"},
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{"g", 1},
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{"p", id},
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}
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});
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std::string body = request.dump();
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std::string output;
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auto curl = curl_easy_init();
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curl_easy_setopt(curl, CURLOPT_URL, "https://g.api.mega.co.nz/cs");
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curl_easy_setopt(curl, CURLOPT_POST, 1L);
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curl_easy_setopt(curl, CURLOPT_POSTFIELDS, body.c_str());
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curl_easy_setopt(curl, CURLOPT_WRITEDATA, &output);
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curl_easy_setopt(curl, CURLOPT_USERAGENT, API_AGENT);
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curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
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curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
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curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
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curl_easy_setopt(
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curl,
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CURLOPT_WRITEFUNCTION,
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+[](void *buffer, size_t size, size_t nmemb, void *userp) -> size_t
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{
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std::string* output = reinterpret_cast<std::string*>(userp);
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size_t actual_size = size * nmemb;
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output->append(reinterpret_cast<char*>(buffer), actual_size);
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return actual_size;
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}
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);
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curl_easy_perform(curl);
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json response = json::parse(output);
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curl_easy_cleanup(curl);
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s64 freeStorage;
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s64 fileSize = response[0]["s"];
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if(R_SUCCEEDED(fs::getFreeStorageSD(freeStorage)) && fileSize * 1.1 > freeStorage)
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return "";
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return response[0]["g"];
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}
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std::string mega_node_key(std::string url)
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{
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/* Check if old link format */
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auto len = url.length();
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if(len < 52)
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throw std::invalid_argument("Invalid URL.");
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bool old_link = url.find("#!") < len;
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/* End with the last '#' or "!" if its the old link format */
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auto end_pos = url.find_last_of(old_link ? '!' : '#') + 1;
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/* Crop the URL to get the file key */
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std::string key = url.substr(end_pos, len - end_pos);
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/* Replace URL characters with B64 characters */
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std::replace(key.begin(), key.end(), '_', '/');
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std::replace(key.begin(), key.end(), '-', '+');
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/* Add padding */
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auto key_len = key.length();
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unsigned pad = 4 - key_len%4;
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key.append(pad, '=');
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/* The encoded key should have 44 characters to produce a 32 byte node key */
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if(key.length() != 44)
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throw std::invalid_argument("Invalid URL key.");
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std::string decoded(key.size()*3/4, 0);
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size_t olen = 0;
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mbedtls_base64_decode(
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reinterpret_cast<unsigned char*>(decoded.data()),
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decoded.size(),
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&olen,
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reinterpret_cast<const unsigned char*>(key.c_str()),
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key.size()
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);
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/**
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* The encoded base64 is (usually?) 43 characters long. With padding it goes
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* to 44. When we calculate the decoded size, we need to allocate 33 bytes.
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* But the last encoded character is padding, and combined with the last
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* valid character, it should produce a 32 byte node key.
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*/
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decoded.resize(olen);
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if(decoded.size() != 32)
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throw std::invalid_argument("Invalid node key.");
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return decoded;
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}
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std::string mega_key(const std::string &node_key)
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{
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std::string key(16, 0);
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reinterpret_cast<uint64_t*>(key.data())[0] =
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reinterpret_cast<const uint64_t*>(node_key.data())[0] ^
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reinterpret_cast<const uint64_t*>(node_key.data())[2]
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;
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reinterpret_cast<uint64_t*>(key.data())[1] =
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reinterpret_cast<const uint64_t*>(node_key.data())[1] ^
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reinterpret_cast<const uint64_t*>(node_key.data())[3]
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;
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return key;
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}
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std::string mega_iv(const std::string &node_key)
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{
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std::string iv(16, 0);
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reinterpret_cast<uint64_t*>(iv.data())[0] =
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reinterpret_cast<const uint64_t*>(node_key.data())[2]
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;
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return iv;
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}
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} // namespace
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long downloadFile(const std::string& url, const std::string& output, int api)
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@ -142,6 +301,17 @@ namespace download {
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time_old = std::chrono::steady_clock::now();
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dlold = 0.0f;
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bool can_download = true;
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bool is_mega = (url.find("mega.nz") != std::string::npos);
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std::string real_url = is_mega ? mega_url(url) : url;
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if (is_mega) {
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std::string node_key = mega_node_key(url);
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std::string key = mega_key(node_key);
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std::string iv = mega_iv(node_key);
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chunk.aes = static_cast<Aes128CtrContext*>(malloc(sizeof(Aes128CtrContext)));
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aes128CtrContextCreate(chunk.aes, key.c_str(), iv.c_str());
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}
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if (curl) {
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FILE* fp = fopen(out, "wb");
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@ -151,11 +321,11 @@ namespace download {
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chunk.out = fp;
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if (*out != 0) {
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can_download = checkSize(curl, url);
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can_download = is_mega ? !real_url.empty() : checkSize(curl, url);
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}
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if (can_download) {
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curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
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curl_easy_setopt(curl, CURLOPT_URL, real_url.c_str());
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curl_easy_setopt(curl, CURLOPT_USERAGENT, API_AGENT);
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curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
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curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
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@ -193,6 +363,7 @@ namespace download {
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}
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free(chunk.data);
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free(chunk.aes);
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return status_code;
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}
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