Extract attachments

src/main.rs

@@ -29,6 +29,14 @@ fn main() -> Result<(), anyhow::Error> {
         println!("Date: {}", date);
     }
     println!("---");
-    print!("{}", message.body()?.text.unwrap_or_default());
+    let parts = message.parts()?;
+    println!("{}", parts.text.unwrap_or_default());
+    for (i, attachment) in parts.attachments.iter().enumerate() {
+        println!(
+            "[{}] {}",
+            i,
+            &attachment.filename.as_deref().unwrap_or("<unnamed>")
+        );
+    }
     Ok(())
 }

src/parsing.rs

@@ -1,33 +1,53 @@
 use mailparse::{DispositionType, MailHeaderMap, ParsedMail};
 
 #[derive(PartialEq, Eq, Debug, Default)]
-pub struct Body {
+pub struct Parts {
     pub text: Option<String>,
     pub html: Option<String>,
+    pub attachments: Vec<Attachment>,
+}
+
+#[derive(PartialEq, Eq, Debug)]
+pub struct Attachment {
+    pub filename: Option<String>,
+    pub ctype: mime::Mime,
+    pub body: Vec<u8>,
+}
+
+impl Attachment {
+    fn from_part(part: &ParsedMail) -> anyhow::Result<Self> {
+        let content_disposition = dbg!(part.get_content_disposition());
+        Ok(Self {
+            filename: content_disposition.params.get("filename").cloned(),
+            ctype: part.ctype.mimetype.parse()?,
+            body: part.get_body_raw()?,
+        })
+    }
 }
 
 pub trait ParsedMailExt {
     fn is_attachment(&self) -> bool;
     fn subject(&self) -> Option<String>;
     fn date(&self) -> Result<Option<chrono::DateTime<chrono::FixedOffset>>, anyhow::Error>;
-    fn body(&self) -> Result<Body, anyhow::Error>;
+    fn parts(&self) -> Result<Parts, anyhow::Error>;
 }
 
-fn find_body(message: &ParsedMail, body: &mut Body) -> Result<(), anyhow::Error> {
-    if message.is_attachment() {
-        return Ok(());
-    }
-    let mimetype: mime::Mime = message.ctype.mimetype.parse()?;
-    if mimetype == mime::TEXT_PLAIN {
-        body.text.get_or_insert(message.get_body()?);
-    } else if mimetype == mime::TEXT_HTML {
-        body.html.get_or_insert(message.get_body()?);
-    }
-    for subpart in &message.subparts {
-        find_body(subpart, body)?;
-        if body.text.is_some() && body.html.is_some() {
+fn find_body(message: &ParsedMail, parts: &mut Parts) -> Result<(), anyhow::Error> {
+    if !message.subparts.is_empty() {
+        for subpart in &message.subparts {
+            find_body(subpart, parts)?;
+        }
+    } else {
+        if message.is_attachment() {
+            parts.attachments.push(Attachment::from_part(message)?);
             return Ok(());
         }
+        let mimetype: mime::Mime = message.ctype.mimetype.parse()?;
+        if mimetype == mime::TEXT_PLAIN {
+            parts.text.get_or_insert(message.get_body()?);
+        } else if mimetype == mime::TEXT_HTML {
+            parts.html.get_or_insert(message.get_body()?);
+        }
     }
     Ok(())
 }
@@ -49,8 +69,8 @@ impl<'a> ParsedMailExt for ParsedMail<'a> {
         Ok(date)
     }
 
-    fn body(&self) -> Result<Body, anyhow::Error> {
-        let mut body = Body::default();
+    fn parts(&self) -> Result<Parts, anyhow::Error> {
+        let mut body = Parts::default();
         find_body(self, &mut body)?;
         Ok(body)
     }
@@ -152,10 +172,11 @@ TsSbamFrw6EgcMWZw61sb2hhLgo=
             )
         );
         assert_eq!(
-            message.body()?,
-            Body {
+            message.parts()?,
+            Parts {
                 text: Some("Prostý text.".to_string()),
                 html: None,
+                ..Default::default()
             },
         );
         Ok(())
@@ -174,10 +195,11 @@ TsSbamFrw6EgcMWZw61sb2hhLgo=
             )
         );
         assert_eq!(
-            message.body()?,
-            Body {
+            message.parts()?,
+            Parts {
                 text: Some("Prostý text.".to_string()),
                 html: Some("<strong>Tučný HTML text</strong>".to_string()),
+                ..Default::default()
             },
         );
         Ok(())
@@ -199,10 +221,15 @@ TsSbamFrw6EgcMWZw61sb2hhLgo=
             )
         );
         assert_eq!(
-            message.body()?,
-            Body {
+            message.parts()?,
+            Parts {
                 text: Some("Prostý text.".to_string()),
                 html: Some("<strong>Tučný HTML text</strong>".to_string()),
+                attachments: vec![Attachment {
+                    filename: Some("test.txt".to_string()),
+                    ctype: mime::TEXT_PLAIN,
+                    body: "Nějaká příloha.\n".into(),
+                }]
             },
         );
         Ok(())