69 lines
3.0 KiB
Kotlin
69 lines
3.0 KiB
Kotlin
package com.android.trisolarisserver.component
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import com.fasterxml.jackson.databind.JsonNode
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import com.fasterxml.jackson.databind.ObjectMapper
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import org.slf4j.LoggerFactory
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import org.springframework.beans.factory.annotation.Value
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import org.springframework.stereotype.Component
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import org.springframework.web.client.RestTemplate
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import org.springframework.web.util.UriComponentsBuilder
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@Component
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class PostalPincodeClient(
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private val restTemplate: RestTemplate,
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private val objectMapper: ObjectMapper,
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@Value("\${pincode.postal.baseUrl:https://api.postalpincode.in}")
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private val baseUrl: String
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) {
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private val logger = LoggerFactory.getLogger(PostalPincodeClient::class.java)
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fun resolve(pinCode: String): PincodeLookupResult {
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return try {
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val first = fetch(baseUrl, pinCode)
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if (first.resolvedCityState != null) return first
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if (first.status == "ERROR" && baseUrl.startsWith("https://")) {
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val httpUrl = baseUrl.replaceFirst("https://", "http://")
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val second = fetch(httpUrl, pinCode)
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if (second.resolvedCityState != null) return second
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return second
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}
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first
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} catch (ex: Exception) {
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logger.warn("Postalpincode lookup failed: {}", ex.message)
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PincodeLookupResult(null, null, "ERROR", "postalpincode.in", ex.message)
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}
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}
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private fun fetch(base: String, pinCode: String): PincodeLookupResult {
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val url = UriComponentsBuilder.fromUriString(base)
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.path("/pincode/{pin}")
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.buildAndExpand(pinCode)
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.toUriString()
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val response = restTemplate.getForEntity(url, String::class.java)
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val body = response.body ?: return PincodeLookupResult(null, null, "EMPTY_BODY", "postalpincode.in")
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val resolved = parseCityState(body)
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val status = if (resolved == null) "ZERO_RESULTS" else "OK"
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return PincodeLookupResult(resolved, body, status, "postalpincode.in")
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}
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private fun parseCityState(body: String): String? {
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val root = objectMapper.readTree(body)
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if (!root.isArray || root.isEmpty) return null
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val first = root.first()
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val status = first.path("Status").asText(null)
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if (!status.equals("Success", true)) return null
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val offices = first.path("PostOffice")
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if (!offices.isArray || offices.isEmpty) return null
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val office = chooseOffice(offices) ?: return null
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val district = office.path("District").asText(null)
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val state = office.path("State").asText(null)
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if (district.isNullOrBlank() && state.isNullOrBlank()) return null
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return listOfNotNull(district?.ifBlank { null }, state?.ifBlank { null }).joinToString(", ")
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}
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private fun chooseOffice(offices: JsonNode): JsonNode? {
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val delivery = offices.firstOrNull { it.path("DeliveryStatus").asText("").equals("Delivery", true) }
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return delivery ?: offices.firstOrNull()
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}
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}
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