Add "receive" Cargo feature

.circleci/config.yml

@@ -29,7 +29,7 @@ references:
         command: |
           export PKG_CONFIG_PATH=/opt/libsodium/lib/pkgconfig:$PKG_CONFIG_PATH
           export LD_LIBRARY_PATH=/opt/libsodium/lib:$LD_LIBRARY_PATH
-          cargo update && cargo build && cargo test
+          cargo update && cargo build --all-targets && cargo build --all-targets --all-features && cargo test --all-features
     - save_cache:
         key: v3-{{ .Environment.CIRCLE_JOB }}-cargo-cache-{{ checksum "Cargo.toml" }}
         paths:

Cargo.toml

@@ -19,7 +19,8 @@ include = [
 edition = "2018"
 
 [features]
-dev = []
+default = ["receive"]
+receive = ["serde_urlencoded"] # Support for receiving and decrypting incoming messages
 
 [dependencies]
 byteorder = "1.0"
@@ -30,7 +31,7 @@ thiserror = "1"
 reqwest = { version = "0.11", features = ["rustls-tls-native-roots", "multipart"], default-features = false }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-serde_urlencoded = "0.7"
+serde_urlencoded = { version = "0.7", optional = true }
 sodiumoxide = "0.2.0"
 
 [dev-dependencies]

README.md

@@ -79,6 +79,13 @@ Look up Threema ID by email hash:
     cargo run --example lookup_id -- by_email_hash <from> <secret> 1ea093239cc5f0e1b6ec81b866265b921f26dc4033025410063309f4d1a8ee2c
 
 
+## Cargo Features
+
+This library offers the following optional features:
+
+- `receive`: Add support for processing incoming messages. Enabled by default.
+
+
 ## Rust Version Requirements (MSRV)
 
 This library generally tracks the latest stable Rust version but tries to

src/lib.rs

@@ -79,6 +79,7 @@ mod connection;
 mod crypto;
 pub mod errors;
 mod lookup;
+#[cfg(feature = "receive")]
 mod receive;
 mod types;
 
@@ -93,10 +94,12 @@ pub use crate::{
     connection::Recipient,
     crypto::{encrypt_file_data, EncryptedMessage, RecipientKey},
     lookup::{Capabilities, LookupCriterion},
-    receive::IncomingMessage,
     types::{BlobId, FileMessage, FileMessageBuilder, MessageType, RenderingType},
 };
 
+#[cfg(feature = "receive")]
+pub use crate::receive::IncomingMessage;
+
 const MSGAPI_URL: &str = "https://msgapi.threema.ch";
 
 #[cfg(test)]