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client.go
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client.go
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package uid
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"github.com/ministryofjustice/opg-modernising-lpa/internal/date"
)
type Doer interface {
Do(*http.Request) (*http.Response, error)
}
type Client struct {
baseURL string
doer Doer
}
func New(baseURL string, lambdaClient Doer) *Client {
return &Client{
baseURL: baseURL,
doer: lambdaClient,
}
}
type DonorDetails struct {
Name string `json:"name"`
Dob date.Date `json:"dob"`
Postcode string `json:"postcode"`
}
type CreateCaseRequestBody struct {
Type string `json:"type"`
Source string `json:"source"`
Donor DonorDetails `json:"donor"`
}
type CreateCaseResponse struct {
UID string `json:"uid"`
BadRequestErrors []CreateCaseResponseBadRequestError `json:"errors"`
}
type CreateCaseResponseBadRequestError struct {
Source string `json:"source"`
Detail string `json:"detail"`
}
func (c *Client) CreateCase(ctx context.Context, body *CreateCaseRequestBody) (string, error) {
if !body.Valid() {
return "", errors.New("CreateCaseRequestBody missing details. Requires Type, Donor name, dob and postcode")
}
body.Source = "APPLICANT"
data, _ := json.Marshal(body)
r, err := http.NewRequestWithContext(ctx, http.MethodPost, c.baseURL+"/cases", bytes.NewReader(data))
if err != nil {
return "", err
}
r.Header.Add("Content-Type", "application/json")
resp, err := c.doer.Do(r)
if err != nil {
return "", err
}
defer resp.Body.Close()
if resp.StatusCode > http.StatusBadRequest {
body, _ := io.ReadAll(resp.Body)
return "", fmt.Errorf("error POSTing to UID service: (%d) %s", resp.StatusCode, string(body))
}
var createCaseResponse CreateCaseResponse
if err := json.NewDecoder(resp.Body).Decode(&createCaseResponse); err != nil {
return "", err
}
if len(createCaseResponse.BadRequestErrors) > 0 {
return "", createCaseResponse.Error()
}
return createCaseResponse.UID, nil
}
func (c *Client) CheckHealth(ctx context.Context) error {
req, err := http.NewRequest(http.MethodGet, c.baseURL+"/health", nil)
if err != nil {
return err
}
resp, err := c.doer.Do(req)
if err != nil {
return err
}
if err := resp.Body.Close(); err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("expected 200 but got %d", resp.StatusCode)
}
return nil
}
func (b CreateCaseRequestBody) Valid() bool {
return b.Type != "" &&
b.Donor.Name != "" &&
!b.Donor.Dob.IsZero() &&
b.Donor.Postcode != ""
}
func (c *CreateCaseResponse) Error() error {
if len(c.BadRequestErrors) == 0 {
return nil
}
detail := fmt.Sprintf("error POSTing to UID service: (400) %s %s", c.BadRequestErrors[0].Source, c.BadRequestErrors[0].Detail)
for _, err := range c.BadRequestErrors[1:] {
detail = fmt.Sprintf("%s, %s %s", detail, err.Source, err.Detail)
}
return errors.New(detail)
}