// API
// API
// API
public async Task <ExchangeRateData> GetItemAsync()
{
ConfigData config = await ConfigDataProvider.GetConfigAsync();
string jsFileName = GetJSFileName();
using (ILockObject lockObject = await FileSystem.FileSystemProvider.LockResourceAsync(jsFileName)) {
ExchangeRateData data = await DataProvider.GetAsync(KEY);
if (data != null && data.SaveTime.Add(config.RefreshInterval) < DateTime.UtcNow)
{
data = null;
}
if (data != null && !await FileSystem.FileSystemProvider.FileExistsAsync(jsFileName))
{
data = null;
}
if (data == null)
{
data = await GetExchangeRatesAsync();
}
await lockObject.UnlockAsync();
return(data);
}
}
private async Task SaveRatesJSAsync(ExchangeRateData data)
{
string file = GetJSFileName();
ScriptBuilder sb = new ScriptBuilder();
sb.Append("// Generated file (see ExchangeRateDataProvider) - Do not modify\n");
sb.Append("YetaWF_CurrencyConverter_Rates = \n");
sb.Append(Utility.JsonSerialize(data.Rates));
sb.Append(";\n");
await FileSystem.FileSystemProvider.WriteAllTextAsync(file, sb.ToString());
}
private async Task <ExchangeRateData> GetExchangeRatesAsync()
{
ConfigData config = await ConfigDataProvider.GetConfigAsync();
if (string.IsNullOrWhiteSpace(config.AppID))
{
throw new InternalError("The App ID has not been specified in the Currency Converter Settings (see Admin > Configuration > Currency Converter Settings) - openexchangerates.org requires an app id to be able to retrieve currency exchange rates");
}
ExchangeRateData data = new ExchangeRateData();
data.Key = KEY;
data.SaveTime = DateTime.UtcNow;
string url = string.Format("{0}://openexchangerates.org/api/latest.json?app_id={1}", config.UseHttps ? "https" : "http", config.AppID);
string json = await GetJSONResponseAsync(url);
CheckForErrors(json);
url = string.Format("{0}://openexchangerates.org/api/currencies.json?app_id={1}", config.UseHttps ? "https" : "http", config.AppID);
string jsonCurrencies = await GetJSONResponseAsync(url);
CheckForErrors(jsonCurrencies);
// get all currencies
Dictionary <string, object> currencies = Utility.JsonDeserialize <Dictionary <string, object> >(jsonCurrencies);
// add all rates
dynamic jsonObject = Utility.JsonDeserialize(json);
var rates = jsonObject.rates;
foreach (var rate in rates)
{
string code = rate.Name;
object currency;
if (!currencies.TryGetValue(code, out currency))// replace 3 digit codes by actual name
{
currency = code;
}
decimal val = (decimal)rate.Value;
data.Rates.Add(new ExchangeRateEntry {
Code = code, CurrencyName = (string)currency, Rate = val
});
}
// Save new rates
UpdateStatusEnum status = await DataProvider.UpdateAsync(KEY, KEY, data);
if (status != UpdateStatusEnum.OK)
{
if (status != UpdateStatusEnum.RecordDeleted)
{
throw new InternalError("Unexpected status {0}", status);
}
if (!await DataProvider.AddAsync(data))
{
throw new InternalError("Unexpected error adding data");
}
}
// Create a javascript file with rates so we can include it in a page
await SaveRatesJSAsync(data);
return(data);
}