Mobile Center webhook triggered Azure Function

Function.cs

using System.Net;
using System.Text.RegularExpressions;

static readonly HttpClient _httpClient = new HttpClient();

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log)
{
    var githubApiToken = "";
    var githubApiUserAgent = "";
    var trelloApiToken = "";
    var trelloApiKey = "";

    var content = await req.Content.ReadAsStringAsync();
    log.Info($"Content: {content}");

    // Read app build data coming from Mobile Center
    dynamic data = await req.Content.ReadAsAsync<object>();

    string releaseNotes = data?.release_notes;
    string platform = data?.platform;
    string version = data?.short_version;
    string build = data?.version;

    if (string.IsNullOrWhiteSpace(releaseNotes))
    {
        return req.CreateResponse(HttpStatusCode.BadRequest, "No release notes specified.");
    }

    // Find the PR # from the release notes
    var prNumber = Regex.Match(releaseNotes, "(Merge pull request #)([0-9]+)").Groups[2];

    if (!prNumber.Success)
    {
        return req.CreateResponse(HttpStatusCode.BadRequest, "No PR number found in release notes.");
    }

    log.Info($"Pull request: {prNumber}");

    // Get PR details from GitHub
    var prUrl = $"https://api.github.com/repos/edsnider/sampleapp/pulls/{prNumber}";
    
    var prRequest = new HttpRequestMessage(HttpMethod.Get, prUrl);
    prRequest.Headers.Add("Authorization", $"token {githubApiToken}");
    prRequest.Headers.Add("User-Agent", $"{githubApiUserAgent}");

    var prResponse = await _httpClient.SendAsync(prRequest);

    if (!prResponse.IsSuccessStatusCode)
    {
        return req.CreateResponse(HttpStatusCode.BadRequest, "Failed to get PR from GitHub.");
    }

    // Read PR data coming back from GitHub
    dynamic pr = await prResponse.Content.ReadAsAsync<object>();

    string prBody = pr?.body;

    if (string.IsNullOrWhiteSpace(prBody))
    {
        return req.CreateResponse(HttpStatusCode.BadRequest, "No PR body.");
    }

    log.Info($"PR Body: {prBody}");

    // Find the Trello card from the PR body
    var cardId = Regex.Match(prBody, "trello\\.com\\/c\\/(.{8})").Groups[1];

    if (!cardId.Success)
    {
        return req.CreateResponse(HttpStatusCode.BadRequest, "No Trello card Id found in PR.");
    }

    log.Info($"card id: {cardId}");

    // Post app build details to Trello card
    var cardComments = $"{platform} app build {version} ({build})";
    var cardCommentsUrl = $"https://api.trello.com/1/cards/{cardId}/actions/comments?text={cardComments}&key={trelloApiKey}&token={trelloApiToken}";

    var cardCommentsRequest = new HttpRequestMessage(HttpMethod.Post, cardCommentsUrl);
    
    var cardCommentsResponse = await _httpClient.SendAsync(cardCommentsRequest);

    if (!cardCommentsResponse.IsSuccessStatusCode)
    {
        return req.CreateResponse(HttpStatusCode.BadRequest, "Failed to post comments to Trello card.");
    }

    return req.CreateResponse(HttpStatusCode.OK, "Trello card updated with app build info.");
}