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Allow downloads from Mega

This commit is contained in:
Angelo Elias Dalzotto 2022-04-25 10:47:50 -03:00
parent ddee32ba66
commit 39cdc2b037

View file

@ -4,6 +4,7 @@
#include <math.h>
#include <switch.h>
#include <time.h>
#include <mbedtls/base64.h>
#include <algorithm>
#include <chrono>
@ -41,6 +42,7 @@ namespace download {
size_t data_size;
u_int64_t offset;
FILE* out;
Aes128CtrContext* aes;
} ntwrk_struct_t;
static size_t WriteMemoryCallback(void* contents, size_t size, size_t num_files, void* userp)
@ -56,7 +58,11 @@ namespace download {
data_struct->offset = 0;
}
memcpy(&data_struct->data[data_struct->offset], contents, realsize);
if(data_struct->aes)
aes128CtrCrypt(data_struct->aes, &data_struct->data[data_struct->offset], contents, realsize);
else
memcpy(&data_struct->data[data_struct->offset], contents, realsize);
data_struct->offset += realsize;
data_struct->data[data_struct->offset] = 0;
return realsize;
@ -107,7 +113,7 @@ namespace download {
}
bool checkSize(CURL* curl, const std::string& url)
{
{
curl_off_t dl;
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
curl_easy_setopt(curl, CURLOPT_USERAGENT, API_AGENT);
@ -125,6 +131,159 @@ namespace download {
}
return true;
}
std::string mega_id(std::string url)
{
auto len = url.length();
if(len < 52)
throw std::invalid_argument("Invalid URL.");
bool old_link = url.find("#!") < len;
/* Start from the last '/' and add 2 characters if old link format starting with '#!' */
auto init_pos = url.find_last_of('/') + (old_link ? 2 : 0) + 1;
/* End with the last '#' or "!" if its the old link format */
auto end_pos = url.find_last_of(old_link ? '!' : '#');
/* Finally crop the url */
std::string id = url.substr(init_pos, end_pos - init_pos);
if(id.length() != 8)
throw std::invalid_argument("Invalid URL ID.");
return id;
}
std::string mega_url(std::string url)
{
std::string id = mega_id(url);
json request = json::array({
{
{"a", "g"},
{"g", 1},
{"p", id},
}
});
std::string body = request.dump();
std::string output;
auto curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, "https://g.api.mega.co.nz/cs");
curl_easy_setopt(curl, CURLOPT_POST, 1L);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, body.c_str());
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &output);
curl_easy_setopt(curl, CURLOPT_USERAGENT, API_AGENT);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
curl_easy_setopt(
curl,
CURLOPT_WRITEFUNCTION,
+[](void *buffer, size_t size, size_t nmemb, void *userp) -> size_t
{
std::string* output = reinterpret_cast<std::string*>(userp);
size_t actual_size = size * nmemb;
output->append(reinterpret_cast<char*>(buffer), actual_size);
return actual_size;
}
);
curl_easy_perform(curl);
json response = json::parse(output);
curl_easy_cleanup(curl);
s64 freeStorage;
s64 fileSize = response[0]["s"];
if(R_SUCCEEDED(fs::getFreeStorageSD(freeStorage)) && fileSize * 1.1 > freeStorage)
return "";
return response[0]["g"];
}
std::string mega_node_key(std::string url)
{
/* Check if old link format */
auto len = url.length();
if(len < 52)
throw std::invalid_argument("Invalid URL.");
bool old_link = url.find("#!") < len;
/* End with the last '#' or "!" if its the old link format */
auto end_pos = url.find_last_of(old_link ? '!' : '#') + 1;
/* Crop the URL to get the file key */
std::string key = url.substr(end_pos, len - end_pos);
/* Replace URL characters with B64 characters */
std::replace(key.begin(), key.end(), '_', '/');
std::replace(key.begin(), key.end(), '-', '+');
/* Add padding */
auto key_len = key.length();
unsigned pad = 4 - key_len%4;
key.append(pad, '=');
/* The encoded key should have 44 characters to produce a 32 byte node key */
if(key.length() != 44)
throw std::invalid_argument("Invalid URL key.");
std::string decoded(key.size()*3/4, 0);
size_t olen = 0;
mbedtls_base64_decode(
reinterpret_cast<unsigned char*>(decoded.data()),
decoded.size(),
&olen,
reinterpret_cast<const unsigned char*>(key.c_str()),
key.size()
);
/**
* The encoded base64 is (usually?) 43 characters long. With padding it goes
* to 44. When we calculate the decoded size, we need to allocate 33 bytes.
* But the last encoded character is padding, and combined with the last
* valid character, it should produce a 32 byte node key.
*/
decoded.resize(olen);
if(decoded.size() != 32)
throw std::invalid_argument("Invalid node key.");
return decoded;
}
std::string mega_key(const std::string &node_key)
{
std::string key(16, 0);
reinterpret_cast<uint64_t*>(key.data())[0] =
reinterpret_cast<const uint64_t*>(node_key.data())[0] ^
reinterpret_cast<const uint64_t*>(node_key.data())[2]
;
reinterpret_cast<uint64_t*>(key.data())[1] =
reinterpret_cast<const uint64_t*>(node_key.data())[1] ^
reinterpret_cast<const uint64_t*>(node_key.data())[3]
;
return key;
}
std::string mega_iv(const std::string &node_key)
{
std::string iv(16, 0);
reinterpret_cast<uint64_t*>(iv.data())[0] =
reinterpret_cast<const uint64_t*>(node_key.data())[2]
;
return iv;
}
} // namespace
long downloadFile(const std::string& url, const std::string& output, int api)
@ -142,6 +301,17 @@ namespace download {
time_old = std::chrono::steady_clock::now();
dlold = 0.0f;
bool can_download = true;
bool is_mega = (url.find("mega.nz") != std::string::npos);
std::string real_url = is_mega ? mega_url(url) : url;
if (is_mega) {
std::string node_key = mega_node_key(url);
std::string key = mega_key(node_key);
std::string iv = mega_iv(node_key);
chunk.aes = static_cast<Aes128CtrContext*>(malloc(sizeof(Aes128CtrContext)));
aes128CtrContextCreate(chunk.aes, key.c_str(), iv.c_str());
}
if (curl) {
FILE* fp = fopen(out, "wb");
@ -151,11 +321,11 @@ namespace download {
chunk.out = fp;
if (*out != 0) {
can_download = checkSize(curl, url);
can_download = is_mega ? !real_url.empty() : checkSize(curl, url);
}
if (can_download) {
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
curl_easy_setopt(curl, CURLOPT_URL, real_url.c_str());
curl_easy_setopt(curl, CURLOPT_USERAGENT, API_AGENT);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
@ -171,7 +341,7 @@ namespace download {
curl_easy_perform(curl);
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &status_code);
if (fp && chunk.offset && can_download)
if (fp && chunk.offset && can_download)
fwrite(chunk.data, 1, chunk.offset, fp);
curl_easy_cleanup(curl);
@ -193,6 +363,7 @@ namespace download {
}
free(chunk.data);
free(chunk.aes);
return status_code;
}