handle withdraw/revive qr code actions

deltachat-ffi/deltachat.h

@@ -2076,6 +2076,10 @@ void            dc_stop_ongoing_process      (dc_context_t* context);
 #define         DC_QR_TEXT                   330 // text1=text
 #define         DC_QR_URL                    332 // text1=URL
 #define         DC_QR_ERROR                  400 // text1=error string
+#define         DC_QR_WITHDRAW_VERIFYCONTACT 500
+#define         DC_QR_WITHDRAW_VERIFYGROUP   502 // text1=groupname
+#define         DC_QR_REVIVE_VERIFYCONTACT   510
+#define         DC_QR_REVIVE_VERIFYGROUP     512 // text1=groupname
 
 /**
  * Check a scanned QR code.
@@ -2097,6 +2101,12 @@ void            dc_stop_ongoing_process      (dc_context_t* context);
  * - DC_QR_TEXT with dc_lot_t::text1=Text
  * - DC_QR_URL with dc_lot_t::text1=URL
  * - DC_QR_ERROR with dc_lot_t::text1=Error string
+ * - DC_QR_WITHDRAW_VERIFYCONTACT, DC_QR_WITHDRAW_VERIFYGROUP
+ *   withdraw own qr-codes, with text1=groupname for groups
+ *   to actually withdraw, call dc_set_config_from_qr() with the code.
+ * - DC_QR_REVIVE_VERIFYCONTACT, DC_QR_REVIVE_VERIFYGROUP,
+ *   revive withdrawn qr-codes, with text1=groupname for groups,
+ *   to actually revive, call dc_set_config_from_qr() with the code.
  *
  * @memberof dc_context_t
  * @param context The context object.

src/lot.rs

@@ -110,6 +110,16 @@ pub enum LotState {
     /// text1=error string
     QrError = 400,
 
+    QrWithdrawVerifyContact = 500,
+
+    /// text1=groupname
+    QrWithdrawVerifyGroup = 502,
+
+    QrReviveVerifyContact = 510,
+
+    /// text1=groupname
+    QrReviveVerifyGroup = 512,
+
     // Message States
     MsgInFresh = 10,
     MsgInNoticed = 13,

src/qr.rs

@@ -6,7 +6,7 @@ use percent_encoding::percent_decode_str;
 use serde::Deserialize;
 use std::collections::BTreeMap;
 
-use crate::chat::{self, ChatIdBlocked};
+use crate::chat::{self, get_chat_id_by_grpid, ChatIdBlocked};
 use crate::config::Config;
 use crate::constants::Blocked;
 use crate::contact::{addr_normalize, may_be_valid_addr, Contact, Origin};
@@ -16,6 +16,7 @@ use crate::log::LogExt;
 use crate::lot::{Lot, LotState};
 use crate::message::Message;
 use crate::peerstate::Peerstate;
+use crate::token;
 
 const OPENPGP4FPR_SCHEME: &str = "OPENPGP4FPR:"; // yes: uppercase
 const DCACCOUNT_SCHEME: &str = "DCACCOUNT:";
@@ -189,6 +190,27 @@ async fn decode_openpgp(context: &Context, qr: &str) -> Lot {
         lot.fingerprint = Some(fingerprint);
         lot.invitenumber = invitenumber;
         lot.auth = auth;
+
+        // scanning own qr-code offers withdraw/revive instead of secure-join
+        if context.is_self_addr(&addr).await.unwrap_or_default() {
+            if let Some(ref invitenumber) = lot.invitenumber {
+                lot.state =
+                    if token::exists(context, token::Namespace::InviteNumber, &*invitenumber).await
+                    {
+                        if lot.state == LotState::QrAskVerifyContact {
+                            LotState::QrWithdrawVerifyContact
+                        } else {
+                            LotState::QrWithdrawVerifyGroup
+                        }
+                    } else {
+                        if lot.state == LotState::QrAskVerifyContact {
+                            LotState::QrReviveVerifyContact
+                        } else {
+                            LotState::QrReviveVerifyGroup
+                        }
+                    }
+            }
+        }
     } else {
         return format_err!("Missing address").into();
     }
@@ -275,7 +297,8 @@ async fn set_account_from_qr(context: &Context, qr: &str) -> Result<(), Error> {
 }
 
 pub async fn set_config_from_qr(context: &Context, qr: &str) -> Result<(), Error> {
-    match check_qr(context, qr).await.state {
+    let lot = check_qr(context, qr).await;
+    match lot.state {
         LotState::QrAccount => set_account_from_qr(context, qr).await,
         LotState::QrWebrtcInstance => {
             let val = decode_webrtc_instance(context, qr).text2;
@@ -284,6 +307,47 @@ pub async fn set_config_from_qr(context: &Context, qr: &str) -> Result<(), Error
                 .await?;
             Ok(())
         }
+        LotState::QrWithdrawVerifyContact | LotState::QrWithdrawVerifyGroup => {
+            token::delete(
+                context,
+                token::Namespace::InviteNumber,
+                lot.invitenumber.unwrap_or_default().as_str(),
+            )
+            .await?;
+            token::delete(
+                context,
+                token::Namespace::Auth,
+                lot.auth.unwrap_or_default().as_str(),
+            )
+            .await?;
+            Ok(())
+        }
+        LotState::QrReviveVerifyContact | LotState::QrReviveVerifyGroup => {
+            let chat_id = if lot.state == LotState::QrReviveVerifyContact {
+                None
+            } else {
+                Some(
+                    get_chat_id_by_grpid(context, &lot.text2.unwrap_or_default())
+                        .await?
+                        .0,
+                )
+            };
+            token::save(
+                context,
+                token::Namespace::InviteNumber,
+                chat_id,
+                lot.invitenumber.unwrap_or_default(),
+            )
+            .await;
+            token::save(
+                context,
+                token::Namespace::Auth,
+                chat_id,
+                lot.auth.unwrap_or_default(),
+            )
+            .await;
+            Ok(())
+        }
         _ => bail!("qr code does not contain config: {}", qr),
     }
 }

src/token.rs

@@ -111,3 +111,14 @@ pub async fn exists(context: &Context, namespace: Namespace, token: &str) -> boo
         .await
         .unwrap_or_default()
 }
+
+pub async fn delete(context: &Context, namespace: Namespace, token: &str) -> Result<()> {
+    context
+        .sql
+        .execute(
+            "DELETE FROM tokens WHERE namespc=? AND token=?;",
+            paramsv![namespace, token],
+        )
+        .await?;
+    Ok(())
+}