public static async Task Run(
[BlobTrigger("summariseddocuments/{name}.{ext}")] Stream myBlob,
[Blob("summariseddocuments/{name}.{ext}.summary.txt", FileAccess.Write)] CloudBlobStream summaryBlob,
string name,
string ext,
TraceWriter log
)
{
// Because suffix filters don't work yet - this should take non-pdfs off the todo list
if (ext.ToLower() != "pdf")
{
return;
}
log.Info($"Text Processing beginning for {name} ({myBlob.Length} Bytes)");
log.Info($"Extracting text from the PDF");
var pages = iTextPDFHelper.GetPDFPages(myBlob, log, ocrImages: true);
log.Info($"Calling Text Analytics to determine key phrases");
Dictionary <string, int> keyPhrases = await TextAnalyticsHelper.GetKeyPhrases(pages, log);
var topPhrases = keyPhrases.OrderByDescending(pair => pair.Value).Take(20).ToList();
log.Info($"Building summary");
string summary = TextAnalyticsHelper.BuildSummary(pages, topPhrases);
log.Info($"Saving summary to new blob");
using (var stream = new MemoryStream(Encoding.UTF8.GetBytes(summary), false))
{
stream.CopyTo(summaryBlob);
}
}