1 files changed, 114 insertions, 0 deletions
diff --git a/src/Package.cpp b/src/Package.cpp
new file mode 100644
index 0000000..c1c00be
--- /dev/null
+++ b/src/Package.cpp
@@ -0,0 +1,114 @@
+#include "../include/Package.hpp"
+#include "../include/curl.hpp"
+#include "../external/rapidjson/error/en.h"
+
+using namespace std;
+using namespace rapidjson;
+
+static Document *packageList = nullptr;
+
+namespace sibs
+{
+    // TODO: Always downloading is fine right now because the package list is small. This should later be modified to use local cache.
+    // The package file should be stored locally (at ~/.sibs/packages.json) and the version file should also be stored.
+    // First we check if the version is incorrect and if it, we download the new packages.json file.
+    // We should only check if the package list is up to date once every 10 minute or so (make it configurable in a config file?)
+    // to improve build performance and reduce server load.
+    // Or maybe we dont have to do that at all....
+    Result<Document*> Package::getPackageList(const char *url)
+    {
+        if(packageList)
+            return Result<Document*>::Ok(packageList);
+        
+        HttpResult httpResult = curl::get(url);
+        if(!httpResult.success)
+            return Result<Document*>::Err(httpResult.str, httpResult.httpCode);
+        
+        Document *doc = new Document();
+        ParseResult parseResult = doc->Parse(httpResult.str.c_str());
+        if(!parseResult)
+        {
+            string errMsg = "Failed to parse package list json file: ";
+            errMsg += GetParseError_En(parseResult.Code());
+            errMsg += " (";
+            errMsg += to_string(parseResult.Offset());
+            errMsg += ")";
+            return Result<Document*>::Err(errMsg);
+        }
+        
+        packageList = doc;
+        return Result<Document*>::Ok(packageList);
+    }
+    
+    Result<string> Package::getPackageUrl(const char *packageName, const char *packageVersion)
+    {
+        Result<Document*> packageList = Package::getPackageList("https://raw.githubusercontent.com/DEC05EBA/sibs_packages/master/packages.json");
+        if(!packageList)
+            return Result<string>::Err(packageList);
+        
+        const Document &packageDoc = *packageList.unwrap();
+        const Value &packageMetaData = packageDoc[packageName];
+        if(!packageMetaData.IsObject())
+        {
+            string errMsg = "No package with the name \"";
+            errMsg += packageName;
+            errMsg += "\" was found";
+            return Result<string>::Err(errMsg);
+        }
+        
+        const Value &packageVersions = packageMetaData["versions"];
+        if(!packageVersions.IsObject())
+        {
+            string errMsg = "Package file is corrupt. ";
+            errMsg += packageName;
+            errMsg += ".versions is not a json object";
+            return Result<string>::Err("errMsg");
+        }
+        
+        const Value &package = packageVersions[packageVersion];
+        if(!package.IsObject())
+        {
+            string errMsg = "Package file is corrupt. ";
+            errMsg += packageName;
+            errMsg += ".versions.";
+            errMsg += packageVersion;
+            errMsg += " is not a json object";
+            return Result<string>::Err(errMsg);
+        }
+        
+        const Value &packageUrlsValue = package["urls"];
+        if(!packageUrlsValue.IsArray())
+        {
+            string errMsg = "Package file is corrupt. ";
+            errMsg += packageName;
+            errMsg += ".versions.";
+            errMsg += packageVersion;
+            errMsg += ".urls is not a json array";
+            return Result<string>::Err(errMsg);
+        }
+        
+        auto packageUrls = packageUrlsValue.GetArray();
+        if(packageUrls.Empty())
+        {
+            string errMsg = "Package file is corrupt. ";
+            errMsg += packageName;
+            errMsg += ".versions.";
+            errMsg += packageVersion;
+            errMsg += ".urls is an empty json array";
+            return Result<string>::Err(errMsg);
+        }
+        
+        const Value &packageUrlValue = packageUrls[0];
+        if(!packageUrlValue.IsString())
+        {
+            string errMsg = "Package file is corrupt. ";
+            errMsg += packageName;
+            errMsg += ".versions.";
+            errMsg += packageVersion;
+            errMsg += ".urls[0] is not a string";
+            return Result<string>::Err(errMsg);
+        }
+        
+        return Result<std::string>::Ok(string(packageUrlValue.GetString(), packageUrlValue.GetStringLength()));
+    }
+}