mirror of
https://github.com/meshtastic/Meshtastic-Android.git
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76ddd29114
Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com> Co-authored-by: Benjamin Faershtein <119711889+RCGV1@users.noreply.github.com>
90 lines
3.7 KiB
Kotlin
90 lines
3.7 KiB
Kotlin
/*
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* Copyright (c) 2025 Meshtastic LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.geeksville.mesh.model
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import android.graphics.Bitmap
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import android.net.Uri
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import android.util.Base64
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import com.geeksville.mesh.AppOnlyProtos.ChannelSet
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import com.geeksville.mesh.android.BuildUtils.errormsg
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import com.google.zxing.BarcodeFormat
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import com.google.zxing.MultiFormatWriter
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import com.journeyapps.barcodescanner.BarcodeEncoder
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import java.net.MalformedURLException
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import kotlin.jvm.Throws
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private const val MESHTASTIC_HOST = "meshtastic.org"
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private const val CHANNEL_PATH = "/e/"
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internal const val URL_PREFIX = "https://$MESHTASTIC_HOST$CHANNEL_PATH"
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private const val BASE64FLAGS = Base64.URL_SAFE + Base64.NO_WRAP + Base64.NO_PADDING
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/**
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* Return a [ChannelSet] that represents the ChannelSet encoded by the URL.
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*
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* @throws MalformedURLException when not recognized as a valid Meshtastic URL
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*/
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@Throws(MalformedURLException::class)
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fun Uri.toChannelSet(): ChannelSet {
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if (fragment.isNullOrBlank() || !host.equals(MESHTASTIC_HOST, true) || !path.equals(CHANNEL_PATH, true)) {
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throw MalformedURLException("Not a valid Meshtastic URL: ${toString().take(40)}")
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}
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// Older versions of Meshtastic clients (Apple/web) included `?add=true` within the URL fragment.
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// This gracefully handles those cases until the newer version are generally available/used.
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val url = ChannelSet.parseFrom(Base64.decode(fragment!!.substringBefore('?'), BASE64FLAGS))
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val shouldAdd =
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fragment?.substringAfter('?', "")?.takeUnless { it.isBlank() }?.equals("add=true")
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?: getBooleanQueryParameter("add", false)
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return url.toBuilder().apply { if (shouldAdd) clearLoraConfig() }.build()
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}
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/** @return A list of globally unique channel IDs usable with MQTT subscribe() */
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val ChannelSet.subscribeList: List<String>
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get() = settingsList.filter { it.downlinkEnabled }.map { Channel(it, loraConfig).name }
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fun ChannelSet.getChannel(index: Int): Channel? =
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if (settingsCount > index) Channel(getSettings(index), loraConfig) else null
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/** Return the primary channel info */
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val ChannelSet.primaryChannel: Channel?
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get() = getChannel(0)
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/**
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* Return a URL that represents the [ChannelSet]
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*
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* @param upperCasePrefix portions of the URL can be upper case to make for more efficient QR codes
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*/
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fun ChannelSet.getChannelUrl(upperCasePrefix: Boolean = false, shouldAdd: Boolean = false): Uri {
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val channelBytes = this.toByteArray() ?: ByteArray(0) // if unset just use empty
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val enc = Base64.encodeToString(channelBytes, BASE64FLAGS)
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val p = if (upperCasePrefix) URL_PREFIX.uppercase() else URL_PREFIX
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val query = if (shouldAdd) "?add=true" else ""
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return Uri.parse("$p$query#$enc")
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}
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fun ChannelSet.qrCode(shouldAdd: Boolean): Bitmap? = try {
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val multiFormatWriter = MultiFormatWriter()
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val bitMatrix =
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multiFormatWriter.encode(getChannelUrl(false, shouldAdd).toString(), BarcodeFormat.QR_CODE, 960, 960)
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val barcodeEncoder = BarcodeEncoder()
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barcodeEncoder.createBitmap(bitMatrix)
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} catch (ex: Throwable) {
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errormsg("URL was too complex to render as barcode")
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null
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}
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