fix: use random adb key if not existing

Cargo.toml

@@ -9,7 +9,7 @@ homepage = "https://github.com/cocool97/adb_client"
 keywords = ["adb", "android", "tcp", "usb"]
 license = "MIT"
 repository = "https://github.com/cocool97/adb_client"
-version = "2.1.14"
+version = "2.1.15"
 
 # To build locally when working on a new release
 [patch.crates-io]

adb_client/src/device/adb_usb_device.rs

@@ -19,19 +19,24 @@ use crate::device::adb_transport_message::{AUTH_RSAPUBLICKEY, AUTH_SIGNATURE, AU
 use crate::{Result, RustADBError, USBTransport};
 
 pub fn read_adb_private_key<P: AsRef<Path>>(private_key_path: P) -> Result<Option<ADBRsaKey>> {
-    Ok(read_to_string(private_key_path.as_ref()).map(|pk| {
-        match ADBRsaKey::new_from_pkcs8(&pk) {
-            Ok(pk) => Some(pk),
-            Err(e) => {
-                log::error!("Error while create RSA private key: {e}");
-                None
-            }
-        }
-    })?)
+    // Try to read the private key file from given path
+    // If the file is not found, return None
+    // If there is another error while reading the file, return this error
+    // Else, return the private key content
+    let pk = match read_to_string(private_key_path.as_ref()) {
+        Ok(pk) => pk,
+        Err(e) if e.kind() == std::io::ErrorKind::NotFound => return Ok(None),
+        Err(e) => return Err(e.into()),
+    };
+
+    match ADBRsaKey::new_from_pkcs8(&pk) {
+        Ok(pk) => Ok(Some(pk)),
+        Err(e) => Err(e),
+    }
 }
 
 /// Search for adb devices with known interface class and subclass values
-fn search_adb_devices() -> Result<Option<(u16, u16)>> {
+pub fn search_adb_devices() -> Result<Option<(u16, u16)>> {
     let mut found_devices = vec![];
     for device in rusb::devices()?.iter() {
         let Ok(des) = device.device_descriptor() else {
@@ -57,7 +62,8 @@ fn search_adb_devices() -> Result<Option<(u16, u16)>> {
     }
 }
 
-fn is_adb_device<T: UsbContext>(device: &Device<T>, des: &DeviceDescriptor) -> bool {
+/// Check whether a device with given descriptor is an ADB device
+pub fn is_adb_device<T: UsbContext>(device: &Device<T>, des: &DeviceDescriptor) -> bool {
     const ADB_SUBCLASS: u8 = 0x42;
     const ADB_PROTOCOL: u8 = 0x1;
 
@@ -134,9 +140,15 @@ impl ADBUSBDevice {
         transport: USBTransport,
         private_key_path: PathBuf,
     ) -> Result<Self> {
-        let private_key = match read_adb_private_key(private_key_path)? {
+        let private_key = match read_adb_private_key(&private_key_path)? {
             Some(pk) => pk,
-            None => ADBRsaKey::new_random()?,
+            None => {
+                log::warn!(
+                    "No private key found at path {}. Using a temporary random one.",
+                    private_key_path.display()
+                );
+                ADBRsaKey::new_random()?
+            }
         };
 
         let mut s = Self {

adb_client/src/device/mod.rs

@@ -11,7 +11,9 @@ mod shell_message_writer;
 use adb_message_device::ADBMessageDevice;
 pub use adb_tcp_device::ADBTcpDevice;
 pub use adb_transport_message::{ADBTransportMessage, ADBTransportMessageHeader};
-pub use adb_usb_device::{ADBUSBDevice, get_default_adb_key_path};
+pub use adb_usb_device::{
+    ADBUSBDevice, get_default_adb_key_path, is_adb_device, search_adb_devices,
+};
 pub use message_writer::MessageWriter;
 pub use models::{ADBRsaKey, MessageCommand, MessageSubcommand};
 pub use shell_message_writer::ShellMessageWriter;

adb_client/src/lib.rs

@@ -17,7 +17,7 @@ mod transports;
 mod utils;
 
 pub use adb_device_ext::ADBDeviceExt;
-pub use device::{ADBTcpDevice, ADBUSBDevice};
+pub use device::{ADBTcpDevice, ADBUSBDevice, is_adb_device, search_adb_devices};
 pub use emulator_device::ADBEmulatorDevice;
 pub use error::{Result, RustADBError};
 pub use mdns::*;