How can I use extractors to extract the following value?

[assembly-winston]

Summary

Would the following string classify as a form?

payload=%7B%22type%22%3A%22block_actions%22%2C%22user%22%3A%7B%22id%22%3A%22U1234567890%22%2C%22username%22%3A%22john_doe%22%2C%22name%22%3A%22john_doe%22%2C%22team_id%22%3A%22T1234567890%22%7D%2C%22api_app_id%22%3A%22A1234567890%22%2C%22token%22%3A%22abcdef1234567890abcdef1234567890%22%2C%22container%22%3A%7B%22type%22%3A%22message%22%2C%22message_ts%22%3A%22123456789.123456%22%2C%22channel_id%22%3A%22C1234567890%22%2C%22is_ephemeral%22%3Afalse%2C%22thread_ts%22%3A%22123456789.654321%22%7D%2C%22trigger_id%22%3A%221234567890.0987654321.abcdef1234567890abcdef1234567890%22%2C%22team%22%3A%7B%22id%22%3A%22T1234567890%22%2C%22domain%22%3A%22example-domain%22%7D%2C%22enterprise%22%3Anull%2C%22is_enterprise_install%22%3Afalse%2C%22channel%22%3A%7B%22id%22%3A%22C1234567890%22%2C%22name%22%3A%22example-channel%22%7D%2C%22message%22%3A%7B%22user%22%3A%22U0987654321%22%2C%22type%22%3A%22message%22%2C%22ts%22%3A%22123456789.123456%22%2C%22bot_id%22%3A%22B1234567890%22%2C%22app_id%22%3A%22A1234567890%22%2C%22text%22%3A%22This+is+an+example+text%2C+replacing+the+original+text+with+something+new%2E%22%2C%22team%22%3A%22T1234567890%22%2C%22thread_ts%22%3A%22123456789.654321%22%2C%22parent_user_id%22%3A%22U1234567890%22%2C%22blocks%22%3A%5B%7B%22type%22%3A%22section%22%2C%22block_id%22%3A%22exampleBlockId1%22%2C%22text%22%3A%7B%22type%22%3A%22mrkdwn%22%2C%22text%22%3A%22This+is+an+example+section%2E%22%2C%22verbatim%22%3Afalse%7D%7D%2C%7B%22type%22%3A%22actions%22%2C%22block_id%22%3A%22exampleBlockId2%22%2C%22elements%22%3A%5B%7B%22type%22%3A%22button%22%2C%22action_id%22%3A%22exampleActionId1%22%2C%22text%22%3A%7B%22type%22%3A%22plain_text%22%2C%22text%22%3A%22%3Acomputer%3A+example-button-1%22%2C%22emoji%22%3Atrue%7D%2C%22url%22%3A%22https%3A%5C%2F%5C%2Fexample.com%5C%2Fexample-path-1%22%7D%2C%7B%22type%22%3A%22button%22%2C%22action_id%22%3A%22exampleActionId2%22%2C%22text%22%3A%7B%22type%22%3A%22plain_text%22%2C%22text%22%3A%22%3Aticket%3A+example-ticket-1%22%2C%22emoji%22%3Atrue%7D%2C%22url%22%3A%22https%3A%5C%2F%5C%2Fexample.com%5C%2Fexample-path-2%22%7D%2C%7B%22type%22%3A%22button%22%2C%22action_id%22%3A%22exampleActionId3%22%2C%22text%22%3A%7B%22type%22%3A%22plain_text%22%2C%22text%22%3A%22%3Apage_facing_up%3A++example-button-2%22%2C%22emoji%22%3Atrue%7D%2C%22url%22%3A%22https%3A%5C%2F%5C%2Fexample.com%5C%2Fexample-path-3%22%7D%2C%7B%22type%22%3A%22button%22%2C%22action_id%22%3A%22exampleActionId4%22%2C%22text%22%3A%7B%22type%22%3A%22plain_text%22%2C%22text%22%3A%22%3Aticket%3A+example-ticket-2%22%2C%22emoji%22%3Atrue%7D%2C%22url%22%3A%22https%3A%5C%2F%5C%2Fexample.com%5C%2Fexample-path-4%22%7D%2C%7B%22type%22%3A%22button%22%2C%22action_id%22%3A%22exampleActionId5%22%2C%22text%22%3A%7B%22type%22%3A%22plain_text%22%2C%22text%22%3A%22%3Aticket%3A+example-ticket-3%22%2C%22emoji%22%3Atrue%7D%2C%22url%22%3A%22https%3A%5C%2F%5C%2Fexample.com%5C%2Fexample-path-5%22%7D%5D%7D%2C%7B%22type%22%3A%22divider%22%2C%22block_id%22%3A%22exampleDividerId%22%7D%2C%7B%22type%22%3A%22actions%22%2C%22block_id%22%3A%22exampleBlockId3%22%2C%22elements%22%3A%5B%7B%22type%22%3A%22button%22%2C%22action_id%22%3A%22exampleActionId6%22%2C%22text%22%3A%7B%22type%22%3A%22plain_text%22%2C%22text%22%3A%22%3Athumbsup%3A%22%2C%22emoji%22%3Atrue%7D%2C%22value%22%3A%22thumbs_up%22%7D%2C%7B%22type%22%3A%22button%22%2C%22action_id%22%3A%22exampleActionId7%22%2C%22text%22%3A%7B%22type%22%3A%22plain_text%22%2C%22text%22%3A%22%3Athumbsdown%3A%22%2C%22emoji%22%3Atrue%7D%2C%22value%22%3A%22thumbs_down%22%7D%5D%7D%5D%7D%2C%22state%22%3A%7B%22values%22%3A%7B%7D%7D%2C%22response_url%22%3A%22https%3A%5C%2F%5C%2Fhooks.slack.com%5C%2Factions%5C%2FT1234567890%5C%2F1234567890123%5C%2Fabcdef1234567890abcdef1234567890%22%2C%22actions%22%3A%5B%7B%22action_id%22%3A%22exampleActionId6%22%2C%22block_id%22%3A%22exampleBlockId3%22%2C%22text%22%3A%7B%22type%22%3A%22plain_text%22%2C%22text%22%3A%22%3Athumbsup%3A%22%2C%22emoji%22%3Atrue%7D%2C%22value%22%3A%22thumbs_up%22%2C%22type%22%3A%22button%22%2C%22action_ts%22%3A%221234567890%22%7D%5D%7D

I have the following struct I'd like to unpack it into:

use chrono::{DateTime, Utc};
    use serde::{Deserialize, Serialize};

    #[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
    pub struct BlockActions {
        pub team: Team,
        pub user: User,
        pub container: Container,
        pub channel: Channel,
        pub actions: Vec<Action>,
    }

    #[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
    pub struct Team {
        pub id: String,
    }

    #[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
    pub struct User {
        pub id: String,
        pub username: String,
        pub team_id: String,
    }

    #[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
    #[serde(tag = "type")]
    pub enum Container {
        #[serde(rename = "message")]
        Message {
            #[serde(rename = "message_ts", with = "super::unix_timestamp")]
            message_timestamp: DateTime<Utc>,

            #[serde(rename = "thread_ts", with = "super::unix_timestamp")]
            thread_timestamp: DateTime<Utc>,
            channel_id: String,
        },
    }

    impl Container {
        pub fn get_thread_ts_in_slack_format(&self) -> String {
            match self {
                Container::Message {
                    thread_timestamp, ..
                } => thread_timestamp.format("%s.%6f").to_string(),
            }
        }
    }

    #[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
    pub struct Channel {
        pub id: String,
        pub name: String,
    }

    #[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
    #[serde(tag = "type")]
    pub enum Action {
        #[serde(rename = "button")]
        Button {
            #[serde(rename = "action_id")]
            id: String,
            block_id: String,
            text: Text,
            value: String,
        },
    }

    #[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
    pub struct Text {
        #[serde(rename = "type")]
        r#type: String,
        text: String,
        emoji: bool,
    }

axum version

0.7.5

[mladedav]

To be clear, you're sending percent-encoded json in a form and want that to be passed, right?

That's pretty specific and I don't think there's a way to extract that automatically with things that Axum provides, but you can write your own extractor doing the encoding.

[assembly-winston]

Yes, which is unfortunately what the Slack API provides in some API calls. Was just checking, thanks!

[jplatte]

You can use #[serde(with = "json_string")], where json_string is this module (just copy-paste and declare the module in your own crate, the source crate is MIT-licensed): https://docs.rs/ruma-common/0.13.0/src/ruma_common/serde/json_string.rs.html

As in:

use axum::extract::Form;

#[derive(Deserialize)]
struct StripeApiForm {
    #[serde(with = "json_string")]
    payload: FormPayload, // the JSON-encoded struct
}

fn handler(Form(form): Form<StripeApiForm>) -> impl IntoResponse {
    todo!()
}