Yggdrasil/services/oauth2Service.js

const { DiscordOAuth2 } = require("@mgalacyber/discord-oauth2")
const oauth2Repository = require("../repositories/oauth2Repository")
const userService = require("./userService")
const authService = require("./authService")
const { StateTypes, Scopes, PromptTypes, ResponseCodeTypes } = require("@mgalacyber/discord-oauth2")
const { DefaultError } = require("../errors/errors")

const oauth2_association = new DiscordOAuth2({
    clientId: process.env.DISCORD_CLIENT_ID,
    clientSecret: process.env.DISCORD_CLIENT_SECRET,
    redirectUri: process.env.DISCORD_ASSOCIATION_REDIRECT_URL
})

const oauth2_login = new DiscordOAuth2({
    clientId: process.env.DISCORD_CLIENT_ID,
    clientSecret: process.env.DISCORD_CLIENT_SECRET,
    redirectUri: process.env.DISCORD_LOGIN_REDIRECT_URL
})

async function generateAssociationDiscordURL(playerUuid) {
    const redirectObject = await oauth2_association.GenerateOAuth2Url({
        state: StateTypes.UserAuth,
        scope: [
            Scopes.Identify
        ],
        prompt: PromptTypes.Consent,
        responseCode: ResponseCodeTypes.Code,
    })
    await oauth2Repository.createLinkAttempt(redirectObject.state, playerUuid)
    return redirectObject
}

async function handleAssociationCallback(provider, code, state) {
    const playerUuid = await oauth2Repository.popLinkAttempt(state)
    if (!playerUuid) {
        throw new DefaultError(400, "Invalid or expired session state.", "InvalidStateError")
    }

    let isProviderAlreadyLinked = false

    try {
        await userService.getPlayerProperty(playerUuid, `${provider}Id`)
        isProviderAlreadyLinked = true
    } catch (error) {
        if (error.code !== 404) throw error   
    }

    if (isProviderAlreadyLinked) {
        throw new DefaultError(409, `Account from ${provider} already linked to that player`, "AlreadyLinkedException")
    }

    try {
        const tokenResponse = await oauth2_association.GetAccessToken(code)
        const userProfile = await oauth2_association.UserDataSchema.GetUserProfile(tokenResponse.accessToken)
        if (!userProfile || !userProfile.id) {
            throw new DefaultError(500, `Failed to retrieve ${provider} profile.`)
        }

        await userService.addPlayerProperty(playerUuid, `${provider}Id`, userProfile.id)
        return {
            code: 200,
            message: "Account linked successfully",
            provider: {
                id: userProfile.id,
                username: userProfile.username
            }
        }
    } catch (error) {
        if (error instanceof DefaultError) throw error
        throw new DefaultError(500, `${provider} authentication failed: + ${error.message}`)
    }
}

async function unlinkAccount(provider, playerUuid) {
    try {
        const property = await userService.getPlayerProperty(playerUuid, `${provider}Id`).catch(() => null)
        if (!property) {
            throw new DefaultError(404, `No ${provider} account linked to this player.`, "NotLinkedError")
        }

        const success = await oauth2Repository.unlinkProviderAccount(provider, playerUuid)
        if (!success) {
            throw new DefaultError(500, "Failed to unlink the account. Please try again.")
        }

        return {
            code: 200,
            message: `${provider} account successfully unlinked.`
        }
    } catch (error) {
        if (error instanceof DefaultError) throw error;
        throw new DefaultError(500, "An error occurred during unlinking: " + error.message)
    }
}

async function generateLoginDiscordURL() {
    const redirectObject = await oauth2_login.GenerateOAuth2Url({
        state: StateTypes.UserAuth,
        scope: [
            Scopes.Identify
        ],
        prompt: PromptTypes.Consent,
        responseCode: ResponseCodeTypes.Code,
    })
    return redirectObject
}

async function handleLoginCallback(provider, code, requestUser) {
    try {
        const tokenResponse = await oauth2_login.GetAccessToken(code)
        const userProfile = await oauth2_login.UserDataSchema.GetUserProfile(tokenResponse.accessToken)
        if (!userProfile || !userProfile.id) {
            throw new DefaultError(500, `Failed to retrieve ${provider} profile.`)
        }

        const propertyObject = await userService.getPlayerPropertyByValue(`${provider}Id`, userProfile.id)
        return await authService.authenticateWithoutPassword({ identifier: propertyObject.property.uuid, requireUser: requestUser || true })

    } catch (error) {
        if (error.code == 404) {
            throw new DefaultError(404, `No ${provider} account linked to any player.`, "NotLinkedError")
        }
        if (error instanceof DefaultError) throw error
        throw new DefaultError(500, `${provider} authentication failed: + ${error.message}`)
    }
}

module.exports = {
    unlinkAccount,
    handleLoginCallback,
    generateLoginDiscordURL,
    handleAssociationCallback,
    generateAssociationDiscordURL
}