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How to handle a POSTed file to an ASP.NET Core application from Microsoft Flow RRS feed

  • Question

  • I have a Microsoft Flow setup with the following steps

    1. When a file is created (SharePoint) (this is pointing to a specific document library
    2. Http (Http), Method: Post, Uri (pointing to my app), Body: File Content from the SharePoint step above.

    My app that I have written is hosted in an Azure Web App and is written in C# in ASP.NET Core.  I'm trying to convert the information that is coming into me from Flow back into the original document and I cannot figure out what is being sent.  When I look in Flow it says the body of the request that was sent is:

    {
      "$content-type": "image/jpeg",
      "$content": "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"
    }

    In my application I originally tried to have a method that looks like 

    [HttpPost]
    public IActionResult Process(List<IFormFile> files)

    but that flow is not submitted a file, so I changed it to the below method

    [HttpPost] public IActionResult ProcessJson([FromBody]FlowFile file) {
    ...
    }

     public class FlowFile
        {
    
            [JsonProperty(PropertyName = "$content-type")]
            public string ContentType { get; set; }
            [JsonProperty(PropertyName = "$content")]
            public string Content { get; set; }
        }

    I also added a block of middleware, so that I could get the actual request body stream.  The middleware that I added has method that looks like this

        public async Task Invoke(HttpContext context)
            {
                var requestBodyStream = new MemoryStream();
                var originalRequestBody = context.Request.Body;
    
                await context.Request.Body.CopyToAsync(requestBodyStream);
                requestBodyStream.Seek(0, SeekOrigin.Begin);
    
                var requestBodyText = new StreamReader(requestBodyStream).ReadToEnd();
    
                var bytes = StringToByteArray(requestBodyText);
                LogRequestMiddleware.LastBody = System.Text.Encoding.Default.GetString(bytes);
                
                requestBodyStream.Seek(0, SeekOrigin.Begin);
                context.Request.Body = requestBodyStream;
    
                await next(context);
                context.Request.Body = originalRequestBody;
            }
    
            private static byte[] StringToByteArray(string hex)
            {
                return Enumerable.Range(0, hex.Length)
                    //.Where(x => x % 2 == 0)
                    .Select(x => Convert.ToByte(hex.Substring(x, 1), 8))
                    .ToArray();
            }

    When I do this The response that I get is below and I cannot figure how to get it back to the correct string that I want.

    &#xD;&#xA;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#x0;&#x10;JFIF&#x0;&#x1;&#x1;&#x1;&#x0;`&#x0;`&#x0;&#x0;&#xFFFD;&#xFFFD;&#x0;C&#x0;&#x8;&#x6;&#x6;&#x7;&#x6;&#x5;&#x8;&#x7;&#x7;&#x7;&#x9;&#x9;&#x8;&#xA;&#xC;&#x14;&#xD;&#xC;&#xB;&#xB;&#xC;&#x19;&#x12;&#x13;&#xF;&#x14;&#x1D;&#x1A;&#x1F;&#x1E;&#x1D;&#x1A;&#x1C;&#x1C; $.&#x27; &quot;,#&#x1C;&#x1C;(7),01444&#x1F;&#x27;9=82&lt;.342&#xFFFD;&#xFFFD;&#x0;C&#x1;&#x9;&#x9;&#x9;&#xC;&#xB;&#xC;&#x18;&#xD;&#xD;&#x18;2!&#x1C;!22222222222222222222222222222222222222222222222222&#xFFFD;&#xFFFD;&#x0;&#x11;&#x8;&#x0;&#x10;&#x0;&#x10;&#x3;&#x1;&quot;&#x0;&#x2;&#x11;&#x1;&#x3;&#x11;&#x1;&#xFFFD;&#xFFFD;&#x0;&#x1F;&#x0;&#x0;&#x1;&#x5;&#x1;&#x1;&#x1;&#x1;&#x1;&#x1;&#x0;&#x0;&#x0;&#x0;&#x0;&#x0;&#x0;&#x0;&#x1;&#x2;&#x3;&#x4;&#x5;&#x6;&#x7;&#x8;&#x9;&#xA;&#xB;&#xFFFD;&#xFFFD;&#x0;&#xFFFD;&#x10;&#x0;&#x2;&#x1;&#x3;&#x3;&#x2;&#x4;&#x3;&#x5;&#x5;&#x4;&#x4;&#x0;&#x0;&#x1;}&#x1;&#x2;&#x3;&#x0;&#x4;&#x11;&#x5;&#x12;!1A&#x6;&#x13;Qa&#x7;&quot;q&#x14;2&#xFFFD;&#xFFFD;&#xFFFD;&#x8;#B&#xFFFD;&#xFFFD;&#x15;R&#xFFFD;&#xFFFD;$3br&#xFFFD;&#x9;&#xA;&#x16;&#x17;&#x18;&#x19;&#x1A;%&amp;&#x27;()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#x0;&#x1F;&#x1;&#x0;&#x3;&#x1;&#x1;&#x1;&#x1;&#x1;&#x1;&#x1;&#x1;&#x1;&#x0;&#x0;&#x0;&#x0;&#x0;&#x0;&#x1;&#x2;&#x3;&#x4;&#x5;&#x6;&#x7;&#x8;&#x9;&#xA;&#xB;&#xFFFD;&#xFFFD;&#x0;&#xFFFD;&#x11;&#x0;&#x2;&#x1;&#x2;&#x4;&#x4;&#x3;&#x4;&#x7;&#x5;&#x4;&#x4;&#x0;&#x1;&#x2;w&#x0;&#x1;&#x2;&#x3;&#x11;&#x4;&#x5;!1&#x6;&#x12;AQ&#x7;aq&#x13;&quot;2&#xFFFD;&#x8;&#x14;B&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#x9;#3R&#xFFFD;&#x15;br&#xFFFD;&#xA;&#x16;$4&#xFFFD;%&#xFFFD;&#x17;&#x18;&#x19;&#x1A;&amp;&#x27;()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#x0;&#xC;&#x3;&#x1;&#x0;&#x2;&#x11;&#x3;&#x11;&#x0;?&#x0;&#xFFFD;&#xB;&#xFFFD;&#xC;&#xFFFD;&#xFFFD;&#xFFFD;&#x2B;X&#xFFFD;K&#xFFFD;&#xFFFD;&#xFFFD;&#x1C;&#xFFFD;&#xFFFD;21&#xFFFD;c&#xFFFD;Z&#xFFFD;&#xFFFD;]&#x8;&#xFFFD;&#x4E5;&#x5;g&#xFFFD;v&#xFFFD;&#xFFFD;;&#xFFFD;&#x1E;:&#x13;&#xFFFD;&#xFFFD;&#x1C;&#x1A;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#xFFFD;&#x11;&#x1D;&#xFFFD;&#xFFFD;&#xFFFD;P&#xFFFD;&#xFFFD;&#x13;&#xFFFD;&#xC;&#x7;&#xFFFD;I&#xFFFD;&#x1F;f&#xFFFD;&gt;&#xFFFD;&#xFFFD;&#xFFFD;m;]&#xFFFD;&#x5AC;u&#x1B;&#xFFFD;nm&#xFFFD;&#xFFFD;&#xFFFD;`&#xFFFD;Q&#xFFFD;&#x12;1&#xFFFD;P6&#xFFFD;s&#xFFFD;9&#xFFFD;|b&#xFFFD;r|&#xFFFD;&#x10;&#xFFFD;&#xFFFD;G&#xFFFD;

    • Moved by CoolDadTx Thursday, August 17, 2017 2:52 PM ASP.NET related
    Thursday, August 17, 2017 12:46 PM