Generate random name when uploading unnamed archives

Fixes https://github.com/timvisee/ffsend/issues/109

Cargo.lock

@@ -510,6 +510,7 @@ dependencies = [
  "pbr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "prettytable-rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "qr2term 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rpassword 4.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

@@ -118,6 +118,7 @@ pathdiff = "0.1"
 pbr = "1"
 prettytable-rs = "0.8"
 qr2term = { version = "0.1", optional = true }
+rand = "0.7"
 regex = "1.3"
 rpassword = "4"
 serde = "1"

src/action/upload.rs

@@ -36,7 +36,7 @@ use crate::urlshorten;
 use crate::util::set_clipboard;
 use crate::util::{
     format_bytes, open_url, print_error, print_error_msg, prompt_yes, quit, quit_error_msg,
-    ErrorHintsBuilder,
+    rand_alphanum_string, ErrorHintsBuilder,
 };
 
 /// A file upload action.
@@ -141,19 +141,8 @@ impl<'a> Upload<'a> {
 
                     // Select the file name to use if not set
                     if file_name.is_none() {
-                        // Require user to specify name if multiple files are given
-                        if paths.len() > 1 {
-                            quit_error_msg(
-                                "you must specify a file name for the archive",
-                                ErrorHintsBuilder::default()
-                                    .name(true)
-                                    .verbose(false)
-                                    .build()
-                                    .unwrap(),
-                            );
-                        }
-
                         // Derive name from given file
+                        if paths.len() == 1 {
                             file_name = Some(
                                 path.canonicalize()
                                     .map_err(|err| ArchiveError::FileName(Some(err)))?
@@ -163,6 +152,10 @@ impl<'a> Upload<'a> {
                                     .map(|s| s.to_owned())
                                     .ok_or(ArchiveError::FileName(None))?,
                             );
+                        } else {
+                            // Unable to derive file name from paths, generate random
+                            file_name = Some(format!("ffsend-archive-{}", rand_alphanum_string(8)));
+                        }
                     }
 
                     // Get the current working directory, including working directory as highest possible root, canonicalize it

src/util.rs

@@ -17,6 +17,7 @@ use std::fmt::{Debug, Display};
 #[cfg(feature = "clipboard-bin")]
 use std::io::ErrorKind as IoErrorKind;
 use std::io::{stderr, stdin, Error as IoError, Write};
+use std::iter;
 use std::path::Path;
 use std::path::PathBuf;
 use std::process::{exit, ExitStatus};
@@ -39,6 +40,8 @@ use ffsend_api::{
     reqwest,
     url::Url,
 };
+use rand::distributions::Alphanumeric;
+use rand::{thread_rng, Rng};
 use regex::Regex;
 use rpassword::prompt_password_stderr;
 #[cfg(feature = "clipboard-bin")]
@@ -1120,3 +1123,12 @@ impl From<ResponseError> for FollowError {
         FollowError::Response(err)
     }
 }
+
+/// Generate a random alphanumeric string with the given length.
+pub fn rand_alphanum_string(len: usize) -> String {
+    let mut rng = thread_rng();
+    iter::repeat(())
+        .map(|()| rng.sample(Alphanumeric))
+        .take(len)
+        .collect()
+}