jsonrpc: add miscGetStickerFolder and miscGetStickers (#3672)

* jsonrpc: add `miscGetStickerFolder` and `miscGetStickers`

* add pr number to changelog

* refactor

* fix clippy

deltachat-jsonrpc/src/api/mod.rs

@@ -24,7 +24,7 @@ use deltachat::{
 use std::collections::BTreeMap;
 use std::sync::Arc;
 use std::{collections::HashMap, str::FromStr};
-use tokio::sync::RwLock;
+use tokio::{fs, sync::RwLock};
 use walkdir::WalkDir;
 use yerpc::rpc;
 
@@ -1500,6 +1500,63 @@ impl CommandApi {
     //       that might get removed later again
     // ---------------------------------------------
 
+    async fn misc_get_sticker_folder(&self, account_id: u32) -> Result<String> {
+        let ctx = self.get_context(account_id).await?;
+        let account_folder = ctx
+            .get_dbfile()
+            .parent()
+            .context("account folder not found")?;
+        let sticker_folder_path = account_folder.join("./stickers");
+        fs::create_dir_all(&sticker_folder_path).await?;
+        sticker_folder_path
+            .to_str()
+            .map(|s| s.to_owned())
+            .context("path conversion to string failed")
+    }
+
+    /// for desktop, get stickers from stickers folder,
+    /// grouped by the folder they are in.
+    async fn misc_get_stickers(&self, account_id: u32) -> Result<HashMap<String, Vec<String>>> {
+        let ctx = self.get_context(account_id).await?;
+        let account_folder = ctx
+            .get_dbfile()
+            .parent()
+            .context("account folder not found")?;
+        let sticker_folder_path = account_folder.join("./stickers");
+        fs::create_dir_all(&sticker_folder_path).await?;
+        let mut result = HashMap::new();
+
+        let mut packs = tokio::fs::read_dir(sticker_folder_path).await?;
+        while let Some(entry) = packs.next_entry().await? {
+            if !entry.file_type().await?.is_dir() {
+                continue;
+            }
+            let pack_name = entry.file_name().into_string().unwrap_or_default();
+            let mut stickers = tokio::fs::read_dir(entry.path()).await?;
+            let mut sticker_paths = Vec::new();
+            while let Some(sticker_entry) = stickers.next_entry().await? {
+                if !sticker_entry.file_type().await?.is_file() {
+                    continue;
+                }
+                let sticker_name = sticker_entry.file_name().into_string().unwrap_or_default();
+                if sticker_name.ends_with(".png") || sticker_name.ends_with(".webp") {
+                    sticker_paths.push(
+                        sticker_entry
+                            .path()
+                            .to_str()
+                            .map(|s| s.to_owned())
+                            .context("path conversion to string failed")?,
+                    );
+                }
+            }
+            if !sticker_paths.is_empty() {
+                result.insert(pack_name, sticker_paths);
+            }
+        }
+
+        Ok(result)
+    }
+
     /// Returns the messageid of the sent message
     async fn misc_send_text_message(
         &self,