improve text parts (#221)

2024-07-05 17:15:12 +00:00 · 2021-10-11 23:04:33 +02:00 · 2021-10-11 23:04:33 +02:00 · d21778c35e
parent 284929d5dc
commit d21778c35e
8 changed files with 127 additions and 177 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@ -369,7 +369,7 @@ dependencies = [
 "chrono",
 "clap",
 "env_logger",
- "htmlescape",
+ "html-escape",
 "imap",
 "imap-proto",
 "lettre",
@ -400,6 +400,15 @@ dependencies = [
 "winapi",
 ]

+[[package]]
+name = "html-escape"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "816ea801a95538fc5f53c836697b3f8b64a9d664c4f0b91efe1fe7c92e4dbcb7"
+dependencies = [
+ "utf8-width",
+]
+
 [[package]]
 name = "html5ever"
 version = "0.25.1"
@ -414,12 +423,6 @@ dependencies = [
 "syn",
 ]

-[[package]]
-name = "htmlescape"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e9025058dae765dee5070ec375f591e2ba14638c63feff74f13805a72e523163"
-
 [[package]]
 name = "httpdate"
 version = "1.0.1"
@ -1388,6 +1391,12 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"

+[[package]]
+name = "utf8-width"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7cf7d77f457ef8dfa11e4cd5933c5ddb5dc52a94664071951219a97710f0a32b"
+
 [[package]]
 name = "uuid"
 version = "0.8.2"
--- a/Cargo.toml
+++ b/Cargo.toml
@ -12,7 +12,7 @@ atty = "0.2.14"
 chrono = "0.4.19"
 clap = { version = "2.33.3", default-features = false, features = ["suggestions", "color"] }
 env_logger = "0.8.3"
-htmlescape = "0.3.1"
+html-escape = "0.2.9"
 imap = "3.0.0-alpha.4"
 imap-proto = "0.14.3"
 # This commit includes the de/serialization of the ContentType
--- a/src/domain/msg/msg_arg.rs
+++ b/src/domain/msg/msg_arg.rs
@ -15,7 +15,7 @@ type Seq<'a> = &'a str;
 type PageSize = usize;
 type Page = usize;
 type Mbox<'a> = Option<&'a str>;
-type Mime = String;
+type TextMime<'a> = &'a str;
 type Raw = bool;
 type All = bool;
 type RawMsg<'a> = &'a str;
@ -30,7 +30,7 @@ pub enum Command<'a> {
    Forward(Seq<'a>, AttachmentsPaths<'a>),
    List(Option<PageSize>, Page),
    Move(Seq<'a>, Mbox<'a>),
-    Read(Seq<'a>, Mime, Raw),
+    Read(Seq<'a>, TextMime<'a>, Raw),
    Reply(Seq<'a>, All, AttachmentsPaths<'a>),
    Save(Mbox<'a>, RawMsg<'a>),
    Search(Query, Option<PageSize>, Page),
@ -103,8 +103,8 @@ pub fn matches<'a>(m: &'a ArgMatches) -> Result<Option<Command<'a>>> {
        debug!("read command matched");
        let seq = m.value_of("seq").unwrap();
        trace!("seq: {}", seq);
-        let mime = format!("text/{}", m.value_of("mime-type").unwrap());
-        trace!("mime: {}", mime);
+        let mime = m.value_of("mime-type").unwrap();
+        trace!("text mime: {}", mime);
        let raw = m.is_present("raw");
        trace!("raw: {}", raw);
        return Ok(Some(Command::Read(seq, mime, raw)));
--- a/src/domain/msg/msg_entity.rs
+++ b/src/domain/msg/msg_entity.rs
@ -1,24 +1,24 @@
 use ammonia;
 use anyhow::{anyhow, Context, Error, Result};
 use chrono::{DateTime, FixedOffset};
-use htmlescape;
+use html_escape;
 use imap::types::Flag;
 use lettre::message::{Attachment, MultiPart, SinglePart};
 use regex::Regex;
 use rfc2047_decoder;
-use serde::Serialize;
 use std::{
+    collections::HashSet,
    convert::{TryFrom, TryInto},
-    fmt, fs,
+    fs,
    path::PathBuf,
 };

 use crate::{
-    config::Account,
+    config::{Account, DEFAULT_SIG_DELIM},
    domain::{
        imap::ImapServiceInterface,
        mbox::Mbox,
-        msg::{msg_utils, Flags, Parts, TextHtmlPart, TextPlainPart, Tpl, TplOverride},
+        msg::{msg_utils, BinaryPart, Flags, Part, Parts, TextPlainPart, Tpl, TplOverride},
        smtp::SmtpServiceInterface,
    },
    output::OutputServiceInterface,
@ -28,8 +28,6 @@ use crate::{
    },
 };

-use super::{BinaryPart, Part};
-
 type Addr = lettre::message::Mailbox;

 /// Representation of a message.
@ -66,39 +64,66 @@ impl Msg {
        self.parts
            .iter()
            .filter_map(|part| match part {
-                Part::Binary(part) => Some(part.clone()),
+                Part::Binary(part) => Some(part.to_owned()),
                _ => None,
            })
            .collect()
    }

-    pub fn join_text_plain_parts(&self) -> String {
-        let text_parts = self
-            .parts
-            .iter()
-            .filter_map(|part| match part {
-                Part::TextPlain(part) => Some(part.content.to_owned()),
-                _ => None,
-            })
-            .collect::<Vec<_>>()
-            .join("\n\n");
-        let text_parts = ammonia::Builder::new()
-            .tags(Default::default())
-            .clean(&text_parts)
-            .to_string();
-        let text_parts = match htmlescape::decode_html(&text_parts) {
-            Ok(text_parts) => text_parts,
-            Err(_) => text_parts,
-        };
-        text_parts
+    /// Fold string body from all plain text parts into a single string body. If no plain text
+    /// parts are found, HTML parts are used instead. The result is sanitized (all HTML markup is
+    /// removed).
+    pub fn fold_text_plain_parts(&self) -> String {
+        let (plain, html) = self.parts.iter().fold(
+            (String::default(), String::default()),
+            |(mut plain, mut html), part| {
+                match part {
+                    Part::TextPlain(part) => {
+                        let glue = if plain.is_empty() { "" } else { "\n\n" };
+                        plain.push_str(glue);
+                        plain.push_str(&part.content);
+                    }
+                    Part::TextHtml(part) => {
+                        let glue = if html.is_empty() { "" } else { "\n\n" };
+                        html.push_str(glue);
+                        html.push_str(&part.content);
+                    }
+                    _ => (),
+                };
+                (plain, html)
+            },
+        );
+        if plain.is_empty() {
+            // Remove HTML markup
+            let sanitized_html = ammonia::Builder::new()
+                .tags(HashSet::default())
+                .clean(&html)
+                .to_string();
+            // Replace `&nbsp;` by regular space
+            let sanitized_html = Regex::new(r"&nbsp;")
+                .unwrap()
+                .replace_all(&sanitized_html, " ")
+                .to_string();
+            // Merge new line chars
+            let sanitized_html = Regex::new(r"(\r?\n ?){2,}")
+                .unwrap()
+                .replace_all(&sanitized_html, "\n\n")
+                .to_string();
+            // Decode HTML entities
+            let sanitized_html = html_escape::decode_html_entities(&sanitized_html).to_string();
+            sanitized_html
+        } else {
+            plain
+        }
    }

-    pub fn join_text_html_parts(&self) -> String {
+    /// Fold string body from all HTML parts into a single string body.
+    fn fold_text_html_parts(&self) -> String {
        let text_parts = self
            .parts
            .iter()
            .filter_map(|part| match part {
-                Part::TextPlain(part) => Some(part.content.to_owned()),
+                Part::TextHtml(part) => Some(part.content.to_owned()),
                _ => None,
            })
            .collect::<Vec<_>>()
@ -110,12 +135,13 @@ impl Msg {
        text_parts
    }

-    pub fn join_text_parts(&self) -> String {
-        let text_parts = self.join_text_plain_parts();
-        if text_parts.is_empty() {
-            self.join_text_html_parts()
+    /// Fold string body from all text parts into a single string body. The mime allows users to
+    /// choose between plain text parts and html text parts.
+    pub fn fold_text_parts(&self, text_mime: &str) -> String {
+        if text_mime == "html" {
+            self.fold_text_html_parts()
        } else {
-            text_parts
+            self.fold_text_plain_parts()
        }
    }

@ -161,7 +187,7 @@ impl Msg {
            self.subject = format!("Re: {}", self.subject);
        }

-        // Text plain parts
+        // Body
        let plain_content = {
            let date = self
                .date
@ -178,8 +204,8 @@ impl Msg {
            let mut content = format!("\n\nOn {}, {} wrote:\n", date, sender);

            let mut glue = "";
-            for line in self.join_text_plain_parts().trim().lines() {
-                if line == "-- \n" {
+            for line in self.fold_text_parts("plain").trim().lines() {
+                if line == DEFAULT_SIG_DELIM {
                    break;
                }
                content.push_str(glue);
@ -192,50 +218,7 @@ impl Msg {
            content
        };

-        // Text HTML parts
-        let html_content = {
-            let date = self
-                .date
-                .as_ref()
-                .map(|date| date.format("%d %b %Y, at %H:%M").to_string())
-                .unwrap_or("unknown date".into());
-            let sender = self
-                .reply_to
-                .as_ref()
-                .or(self.from.as_ref())
-                .and_then(|addrs| addrs.first())
-                .map(|addr| addr.name.to_owned().unwrap_or(addr.email.to_string()))
-                .unwrap_or("unknown sender".into());
-            let mut content = format!("\n\nOn {}, {} wrote:\n", date, sender);
-
-            let mut glue = "";
-            for line in self.join_text_html_parts().trim().lines() {
-                if line == "-- \n" {
-                    break;
-                }
-                content.push_str(glue);
-                content.push_str(">");
-                content.push_str(if line.starts_with(">") { "" } else { " " });
-                content.push_str(line);
-                glue = "\n";
-            }
-
-            content
-        };
-
-        self.parts = Parts::default();
-
-        if !plain_content.is_empty() {
-            self.parts.push(Part::TextPlain(TextPlainPart {
-                content: plain_content,
-            }));
-        }
-
-        if !html_content.is_empty() {
-            self.parts.push(Part::TextHtml(TextHtmlPart {
-                content: html_content,
-            }));
-        }
+        self.parts = Parts(vec![Part::new_text_plain(plain_content)]);

        Ok(self)
    }
@ -271,73 +254,37 @@ impl Msg {
            self.subject = format!("Fwd: {}", self.subject);
        }

-        // Text plain parts
-        {
-            let mut content = String::default();
-            content.push_str("\n\n-------- Forwarded Message --------\n");
-            content.push_str(&format!("Subject: {}\n", prev_subject));
-            if let Some(date) = prev_date {
-                content.push_str(&format!("Date: {}\n", date.to_rfc2822()));
-            }
-            if let Some(addrs) = prev_from.as_ref() {
-                content.push_str("From: ");
-                let mut glue = "";
-                for addr in addrs {
-                    content.push_str(glue);
-                    content.push_str(&addr.to_string());
-                    glue = ", ";
-                }
-                content.push_str("\n");
-            }
-            if let Some(addrs) = prev_to.as_ref() {
-                content.push_str("To: ");
-                let mut glue = "";
-                for addr in addrs {
-                    content.push_str(glue);
-                    content.push_str(&addr.to_string());
-                    glue = ", ";
-                }
-                content.push_str("\n");
+        // Body
+        let mut content = String::default();
+        content.push_str("\n\n-------- Forwarded Message --------\n");
+        content.push_str(&format!("Subject: {}\n", prev_subject));
+        if let Some(date) = prev_date {
+            content.push_str(&format!("Date: {}\n", date.to_rfc2822()));
+        }
+        if let Some(addrs) = prev_from.as_ref() {
+            content.push_str("From: ");
+            let mut glue = "";
+            for addr in addrs {
+                content.push_str(glue);
+                content.push_str(&addr.to_string());
+                glue = ", ";
            }
            content.push_str("\n");
-            content.push_str(&self.join_text_plain_parts());
-            self.parts
-                .replace_text_plain_parts_with(TextPlainPart { content })
        }
-
-        // Text HTML parts
-        {
-            let mut content = String::default();
-            content.push_str("\n\n-------- Forwarded Message --------\n");
-            content.push_str(&format!("Subject: {}\n", prev_subject));
-            if let Some(date) = prev_date {
-                content.push_str(&format!("Date: {}\n", date.to_rfc2822()));
-            }
-            if let Some(addrs) = prev_from.as_ref() {
-                content.push_str("From: ");
-                let mut glue = "";
-                for addr in addrs {
-                    content.push_str(glue);
-                    content.push_str(&addr.to_string());
-                    glue = ", ";
-                }
-                content.push_str("\n");
-            }
-            if let Some(addrs) = prev_to.as_ref() {
-                content.push_str("To: ");
-                let mut glue = "";
-                for addr in addrs {
-                    content.push_str(glue);
-                    content.push_str(&addr.to_string());
-                    glue = ", ";
-                }
-                content.push_str("\n");
+        if let Some(addrs) = prev_to.as_ref() {
+            content.push_str("To: ");
+            let mut glue = "";
+            for addr in addrs {
+                content.push_str(glue);
+                content.push_str(&addr.to_string());
+                glue = ", ";
            }
            content.push_str("\n");
-            content.push_str(&self.join_text_html_parts());
-            self.parts
-                .replace_text_html_parts_with(TextHtmlPart { content })
        }
+        content.push_str("\n");
+        content.push_str(&self.fold_text_parts("plain"));
+        self.parts
+            .replace_text_plain_parts_with(TextPlainPart { content });

        Ok(self)
    }
@ -628,7 +575,7 @@ impl TryInto<lettre::Message> for &Msg {
        };

        let mut multipart =
-            MultiPart::mixed().singlepart(SinglePart::plain(self.join_text_plain_parts()));
+            MultiPart::mixed().singlepart(SinglePart::plain(self.fold_text_plain_parts()));

        for part in self.attachments() {
            let filename = part.filename;
@ -803,12 +750,3 @@ pub fn parse_some_addrs(addrs: &Option<Vec<imap_proto::Address>>) -> Result<Opti
        None => None,
    })
 }
-
-#[derive(Debug, Serialize)]
-pub struct PrintableMsg(pub String);
-
-impl fmt::Display for PrintableMsg {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        writeln!(f, "{}", self.0)
-    }
-}
--- a/src/domain/msg/msg_handler.rs
+++ b/src/domain/msg/msg_handler.rs
@ -25,8 +25,6 @@ use crate::{
    output::OutputServiceInterface,
 };

-use super::PrintableMsg;
-
 /// Download all attachments from the given message sequence number to the user account downloads
 /// directory.
 pub fn attachments<OutputService: OutputServiceInterface, ImapService: ImapServiceInterface>(
@ -203,19 +201,18 @@ pub fn move_<OutputService: OutputServiceInterface, ImapService: ImapServiceInte
 /// Read a message by its sequence number.
 pub fn read<OutputService: OutputServiceInterface, ImapService: ImapServiceInterface>(
    seq: &str,
-    // TODO: use the mime to select the right body
-    _mime: String,
+    text_mime: &str,
    raw: bool,
    output: &OutputService,
    imap: &mut ImapService,
 ) -> Result<()> {
-    if raw {
-        let msg = String::from_utf8(imap.find_raw_msg(&seq)?)?;
-        output.print(PrintableMsg(msg))
+    let msg = if raw {
+        String::from_utf8(imap.find_raw_msg(&seq)?)?
    } else {
-        let msg = imap.find_msg(&seq)?.join_text_parts();
-        output.print(PrintableMsg(msg))
-    }
+        imap.find_msg(&seq)?.fold_text_parts(text_mime)
+    };
+
+    output.print(msg)
 }

 /// Reply to the given message UID.
--- a/src/domain/msg/parts_entity.rs
+++ b/src/domain/msg/parts_entity.rs
@ -27,6 +27,12 @@ pub enum Part {
    Binary(BinaryPart),
 }

+impl Part {
+    pub fn new_text_plain(content: String) -> Self {
+        Self::TextPlain(TextPlainPart { content })
+    }
+}
+
 #[derive(Debug, Clone, Default, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct Parts(pub Vec<Part>);
--- a/src/domain/msg/tpl_entity.rs
+++ b/src/domain/msg/tpl_entity.rs
@ -83,7 +83,7 @@ impl Tpl {
        if let Some(body) = opts.body {
            tpl.push_str(body);
        } else {
-            tpl.push_str(&msg.join_text_plain_parts())
+            tpl.push_str(&msg.fold_text_plain_parts())
        }

        // Signature
--- a/src/main.rs
+++ b/src/main.rs
@ -111,8 +111,8 @@ fn main() -> Result<()> {
        Some(msg_arg::Command::Move(seq, target)) => {
            return msg_handler::move_(seq, target, &output, &mut imap);
        }
-        Some(msg_arg::Command::Read(seq, mime, raw)) => {
-            return msg_handler::read(seq, mime, raw, &output, &mut imap);
+        Some(msg_arg::Command::Read(seq, text_mime, raw)) => {
+            return msg_handler::read(seq, text_mime, raw, &output, &mut imap);
        }
        Some(msg_arg::Command::Reply(seq, all, atts)) => {
            return msg_handler::reply(seq, all, atts, &account, &output, &mut imap, &mut smtp);