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Implemented HTML endpoint that shows generated EPC QR Code in a simple web site

This commit is contained in:
dankito 2023-04-10 23:53:22 +02:00
parent b0f118cfad
commit a167e8eeac
3 changed files with 58 additions and 4 deletions
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30
EpcQrCodeRest/src/main/kotlin/net/codinux/banking/epcqrcode/rest/EpcQrCodeResource.kt
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@ -3,6 +3,7 @@ package net.codinux.banking.epcqrcode.rest
import net.codinux.banking.epcqrcode.rest.dto.GenerateEpcQrCodeRequest
import net.codinux.banking.epcqrcode.rest.dto.GenerateEpcQrCodeResponse
import net.codinux.banking.epcqrcode.rest.service.EpcQrCodeService
import net.codinux.banking.epcqrcode.rest.service.HtmlService
import org.eclipse.microprofile.openapi.annotations.Operation
import org.eclipse.microprofile.openapi.annotations.media.Content
import org.eclipse.microprofile.openapi.annotations.media.Schema
@ -21,8 +22,8 @@ import javax.ws.rs.core.Response
@Produces(MediaType.APPLICATION_JSON)
@Tag(name = "EPC QR Code")
class EpcQrCodeResource(
@Inject
private val service: EpcQrCodeService
@Inject private val service: EpcQrCodeService,
@Inject private val htmlService: HtmlService
) {
private val log = LoggerFactory.getLogger(EpcQrCodeResource::class.java)
@ -33,7 +34,7 @@ class EpcQrCodeResource(
content = [ Content(mediaType = "application/json", schema = Schema(implementation = GenerateEpcQrCodeResponse::class)) ])
@APIResponse(responseCode = "500", description = "An internal error occurred")
@GET
fun createEpcQrCodeGet(@BeanParam request: GenerateEpcQrCodeRequest): Response {
fun createEpcQrCodeJsonGet(@BeanParam request: GenerateEpcQrCodeRequest): Response {
return handleJsonRequest(request)
}
@ -43,13 +44,34 @@ class EpcQrCodeResource(
@APIResponse(responseCode = "500", description = "An internal error occurred")
@POST
@Consumes(MediaType.APPLICATION_JSON)
fun createEpcQrCodePost(
fun createEpcQrCodeJsonPost(
@RequestBody(content = [ Content(schema = Schema(implementation = GenerateEpcQrCodeRequest::class)) ])
request: GenerateEpcQrCodeRequest
): Response {
return handleJsonRequest(request)
}
@Operation(summary = "Creates a EPC QR code (also marketed as GiroCode, scan2Code, ...)")
@APIResponse(responseCode = "200", description = "The generated EPC QR Code")
@APIResponse(responseCode = "500", description = "An internal error occurred")
@GET
@Produces(MediaType.TEXT_HTML)
fun createEpcQrCodeHtml(@BeanParam request: GenerateEpcQrCodeRequest): Response {
return try {
val qrCodeBytes = service.generateEpcQrCodeBase64EncodedString(request)
Response.ok(htmlService.createHtmlPage(request.imageHeightAndWidth, qrCodeBytes))
.header("Access-Control-Allow-Origin", "*")
.build()
} catch (e: Exception) {
log.error("Could not create QR code for $request", e)
Response.status(Response.Status.INTERNAL_SERVER_ERROR.statusCode, e.localizedMessage) // TODO: it's almost always a bad idea to pass exception message to the outside
.header("Access-Control-Allow-Origin", "*")
.build()
}
}
private fun handleJsonRequest(request: GenerateEpcQrCodeRequest): Response {
return try {
val qrCodeBytes = service.generateEpcQrCodeBase64Encoded(request)

6
EpcQrCodeRest/src/main/kotlin/net/codinux/banking/epcqrcode/rest/service/EpcQrCodeService.kt
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@ -20,6 +20,12 @@ class EpcQrCodeService {
return base64Encoder.encode(epcQrCode.bytes)
}
fun generateEpcQrCodeBase64EncodedString(request: GenerateEpcQrCodeRequest): String {
val epcQrCode = generateEpcQrCode(request)
return base64Encoder.encodeToString(epcQrCode.bytes)
}
private fun generateEpcQrCode(request: GenerateEpcQrCodeRequest): EpcQrCode {
return epcQrCodeGenerator.generateEpcQrCode(mapToEpcQrCodeConfig(request))
}

26
EpcQrCodeRest/src/main/kotlin/net/codinux/banking/epcqrcode/rest/service/HtmlService.kt Normal file
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@ -0,0 +1,26 @@
package net.codinux.banking.epcqrcode.rest.service
import javax.enterprise.context.ApplicationScoped
@ApplicationScoped
class HtmlService {
fun createHtmlPage(heightAndWidth: Int, qrCodeBase64Encoded: String): String {
return StringBuilder()
.appendLine("<!DOCTYPE html>")
.appendLine("<html>")
.appendLine("<head>")
.appendLine("<meta charset=\"UTF-8\">")
.appendLine("<title>EPC QR code (also marketed as GiroCode, scan2Code, ...)</title>")
.appendLine("</head>")
.appendLine("<body>")
.appendLine("<div style=\"height: 100vh; width: 100%; display: flex; justify-content: center; align-items: center;\">")
.appendLine("<img width=\"$heightAndWidth\" height=\"$heightAndWidth\" alt=\"EPC QR code (also marketed as GiroCode, scan2Code, ...)\" " +
"src=\"data:image/png;base64,$qrCodeBase64Encoded\" />")
.appendLine("</div>")
.appendLine("</body>")
.appendLine("</html>")
.toString()
}
}