added function to parse pptx presentations and chunk slides and chunk base64 images to send them with sse

runtime/Cargo.toml

@@ -38,6 +38,7 @@ calamine = "0.27.0"
 pdfium-render = "0.8.31"
 sys-locale = "0.3.2"
 cfg-if = "1.0.0"
+pptx-to-md = "0.3.0"
 
 # Fixes security vulnerability downstream, where the upstream is not fixed yet:
 url = "2.5"

runtime/src/file_data.rs

@@ -1,22 +1,24 @@
-use std::path::Path;
+use std::cmp::min;
-use std::pin::Pin;
+use crate::api_token::APIToken;
+use crate::pandoc::PandocProcessBuilder;
+use crate::pdfium::PdfiumInit;
 use async_stream::stream;
 use base64::{engine::general_purpose, Engine as _};
 use calamine::{open_workbook_auto, Reader};
 use file_format::{FileFormat, Kind};
 use futures::{Stream, StreamExt};
 use pdfium_render::prelude::Pdfium;
+use pptx_to_md::{ImageHandlingMode, ParserConfig, PptxContainer};
+use rocket::get;
+use rocket::response::stream::{Event, EventStream};
+use rocket::serde::Serialize;
+use rocket::tokio::select;
+use rocket::Shutdown;
+use std::path::Path;
+use std::pin::Pin;
 use tokio::io::AsyncBufReadExt;
 use tokio::sync::mpsc;
 use tokio_stream::wrappers::ReceiverStream;
-use rocket::Shutdown;
-use rocket::response::stream::{EventStream, Event};
-use rocket::tokio::select;
-use rocket::serde::Serialize;
-use rocket::get;
-use crate::api_token::APIToken;
-use crate::pandoc::PandocProcessBuilder;
-use crate::pdfium::PdfiumInit;
 
 #[derive(Debug, Serialize)]
 pub struct Chunk {
@@ -31,17 +33,36 @@ pub enum Metadata {
     Spreadsheet { sheet_name: String, row_number: usize },
     Document,
     Image,
+    Presentation {
+        slide_number: u32,
+        image: Option<Base64Image>,
+    },
+}
+
+#[derive(Debug, Serialize)]
+pub struct Base64Image {
+    pub id: String,
+    pub content: String,
+    pub segment: usize,
+    pub is_end: bool
+}
+
+impl Base64Image {
+    fn new(id: String, content: String, segment: usize, is_end: bool) -> Self {
+        Self { id, content, segment, is_end }
+    }
 }
 
 const TO_MARKDOWN: &str = "markdown";
 const DOCX: &str = "docx";
 const ODT: &str = "odt";
+const IMAGE_SEGMENT_SIZE_IN_CHARS: usize = 8_192; // equivalent to ~ 5500 token
 
 type Result<T> = std::result::Result<T, Box<dyn std::error::Error + Send + Sync>>;
 type ChunkStream = Pin<Box<dyn Stream<Item = Result<Chunk>> + Send>>;
 
 #[get("/retrieval/fs/extract?<path>")]
-pub async fn extract_data(_token: APIToken, path: String, mut end: Shutdown) -> EventStream![] {
+pub async fn extract_data(path: String, mut end: Shutdown) -> EventStream![] {
     EventStream! {
         let stream_result = stream_data(&path).await;
         match stream_result {
@@ -87,6 +108,8 @@ async fn stream_data(file_path: &str) -> Result<ChunkStream> {
             convert_with_pandoc(file_path, from, TO_MARKDOWN).await?
         }
 
+        "pptx" => stream_pptx(file_path).await?,
+        
         "xlsx" | "ods" | "xls" | "xlsm" | "xlsb" | "xla" | "xlam" => {
             stream_spreadsheet_as_csv(file_path).await?
         }
@@ -115,7 +138,7 @@ async fn stream_data(file_path: &str) -> Result<ChunkStream> {
             
             Kind::Presentation => match fmt {
                 FileFormat::OfficeOpenXmlPresentation => {
-                    convert_with_pandoc(file_path, fmt.extension(), TO_MARKDOWN).await?
+                    stream_pptx(file_path).await?
                 }
                 _ => stream_text_file(file_path).await?,
             },
@@ -295,3 +318,86 @@ async fn chunk_image(file_path: &str) -> Result<ChunkStream> {
 
     Ok(Box::pin(stream))
 }
+
+async fn stream_pptx(file_path: &str) -> Result<ChunkStream> {
+    let path = Path::new(file_path).to_owned();
+
+    let parser_config = ParserConfig::builder()
+        .extract_images(true)
+        .compress_images(true)
+        .quality(75)
+        .image_handling_mode(ImageHandlingMode::Manually)
+        .build();
+
+    let mut streamer = tokio::task::spawn_blocking(move || {
+        PptxContainer::open(&path, parser_config).map_err(|e| Box::new(e) as Box<dyn std::error::Error + Send + Sync>)
+    }).await??;
+
+    let (tx, rx) = mpsc::channel(32);
+
+    tokio::spawn(async move {
+        for slide_result in streamer.iter_slides() {
+            match slide_result {
+                Ok(slide) => {
+                    if let Some(md_content) = slide.convert_to_md() {
+                        let chunk = Chunk {
+                            content: md_content,
+                            metadata: Metadata::Presentation {
+                                slide_number: slide.slide_number,
+                                image: None,
+                            },
+                        };
+
+                        if tx.send(Ok(chunk)).await.is_err() {
+                            break;
+                        }
+                    }
+
+                    if let Some(images) = slide.load_images_manually() {
+                        for image in images.iter() {
+                            let base64_data = &image.base64_content;
+
+                            let total_length = base64_data.len();
+                            let mut offset = 0;
+                            let mut segment_index = 0;
+
+                            while offset < total_length {
+                                let end = min(offset + IMAGE_SEGMENT_SIZE_IN_CHARS, total_length);
+                                let segment_content = &base64_data[offset..end];
+                                let is_end = end == total_length;
+
+                                let base64_image = Base64Image::new(
+                                    image.img_ref.id.clone(),
+                                    segment_content.to_string(),
+                                    segment_index,
+                                    is_end
+                                );
+
+                                let chunk = Chunk {
+                                    content: String::new(),
+                                    metadata: Metadata::Presentation {
+                                        slide_number: slide.slide_number,
+                                        image: Some(base64_image),
+                                    },
+                                };
+
+                                if tx.send(Ok(chunk)).await.is_err() {
+                                    break;
+                                }
+
+                                offset = end;
+                                segment_index += 1;
+                            }
+                        }
+                    }
+                },
+                Err(e) => {
+                    let _ = tx.send(Err(Box::new(e) as Box<dyn std::error::Error + Send + Sync>)).await;
+                    break;
+                }
+            }
+        }
+    });
+
+    Ok(Box::pin(ReceiverStream::new(rx)))
+}