Mistral OCR - Get markdown from PDF

MistralOcrMarkdown.cs

using System.Net.Http.Json;
using System.Text.Json;
using System.Text.Json.Serialization;

var endpoint = "https://<endpoint>.<region>.models.ai.azure.com/";
var apiKey = "";

var inputFilePath = @"";  // The path of the source PDF
var outputFilePath = @""; // The path of the destination Markdown file

var base64Content = Convert.ToBase64String(await File.ReadAllBytesAsync(inputFilePath));

Console.WriteLine($"Getting the markdown for {inputFilePath}...");

var httpClient = new HttpClient()
{
    BaseAddress = new Uri(endpoint),
    DefaultRequestHeaders =
    {
        { "Authorization", $"Bearer {apiKey}" }
    }
};

var content = new
{
    model = "mistral-ocr-2503",
    document = new
    {
        type = "document_url",
        document_url = $"data:application/pdf;base64,{base64Content}"
    }
};

var jsonContent = JsonContent.Create(content, options: JsonSerializerOptions.Web);
await jsonContent.LoadIntoBufferAsync();

using var response = await httpClient.PostAsync($"v1/ocr", jsonContent);

Console.WriteLine($"Response status code: {response.StatusCode}");

if (response.IsSuccessStatusCode)
{
    var ocrResponse = await response.Content.ReadFromJsonAsync<OcrResponse>();
    
    Console.WriteLine();
    foreach (var page in ocrResponse!.Pages)
    {
        Console.WriteLine(page.Markdown);
    }

    Console.WriteLine();
    Console.WriteLine($"Pages processed: {ocrResponse.UsageInfo.PagesProcessed}");
    Console.WriteLine($"Document size: {ocrResponse.UsageInfo.DocumentSize} bytes");
    Console.WriteLine();

    await File.AppendAllLinesAsync(outputFilePath, ocrResponse.Pages.Select(p => p.Markdown));
    Console.WriteLine($"The file {outputFilePath} has been saved.");
}
else
{
    Console.WriteLine($"Error: {await response.Content.ReadAsStringAsync()}");
}

public record class OcrResponse(IEnumerable<OcrPage> Pages, [property: JsonPropertyName("usage_info")] OcrUsageInfo UsageInfo);

public record class OcrPage(string Markdown);

public record class OcrUsageInfo([property: JsonPropertyName("pages_processed")] int PagesProcessed, 
                                 [property: JsonPropertyName("doc_size_bytes")] int DocumentSize);