From 7121ff0b8d0a3b0888dae67fa5aaf305fcf18bc3 Mon Sep 17 00:00:00 2001
From: VinnyHC <vinny.mannello@hashicorp.com>
Date: Thu, 24 Feb 2022 23:47:57 +0000
Subject: [PATCH] backport of commit 8023e4c2fa72d6bcc80682cb5e5e35f8b692e4e1

---
 api/sys_raft.go     | 81 +++++++++++++++++++++++++++++++++++++++++----
 changelog/14269.txt |  3 ++
 2 files changed, 78 insertions(+), 6 deletions(-)
 create mode 100644 changelog/14269.txt

diff --git a/api/sys_raft.go b/api/sys_raft.go
index 043a698010680..3956354f46479 100644
--- a/api/sys_raft.go
+++ b/api/sys_raft.go
@@ -272,24 +272,93 @@ func (c *Sys) RaftSnapshot(snapWriter io.Writer) error {
 }
 
 // RaftSnapshotRestore reads the snapshot from the io.Reader and installs that
-// snapshot, returning the cluster to the state defined by it.
+// snapshot, returning the cluster to the state defined by it. This avoids the use of
+// RawRequestWithContext which copies the body (leading to possible OOMs) for retrying
 func (c *Sys) RaftSnapshotRestore(snapReader io.Reader, force bool) error {
 	path := "/v1/sys/storage/raft/snapshot"
 	if force {
 		path = "/v1/sys/storage/raft/snapshot-force"
 	}
-	r := c.c.NewRequest("POST", path)
 
-	r.Body = snapReader
+	r := c.c.NewRequest(http.MethodPost, path)
+	r.URL.RawQuery = r.Params.Encode()
 
-	ctx, cancelFunc := context.WithCancel(context.Background())
-	defer cancelFunc()
-	resp, err := c.c.RawRequestWithContext(ctx, r)
+	req, err := http.NewRequest(http.MethodPost, r.URL.RequestURI(), snapReader)
 	if err != nil {
 		return err
 	}
+
+	req.URL.User = r.URL.User
+	req.URL.Scheme = r.URL.Scheme
+	req.URL.Host = r.URL.Host
+	req.Host = r.URL.Host
+
+	if r.Headers != nil {
+		for header, vals := range r.Headers {
+			for _, val := range vals {
+				req.Header.Add(header, val)
+			}
+		}
+	}
+
+	if len(r.ClientToken) != 0 {
+		req.Header.Set(consts.AuthHeaderName, r.ClientToken)
+	}
+
+	if len(r.WrapTTL) != 0 {
+		req.Header.Set("X-Vault-Wrap-TTL", r.WrapTTL)
+	}
+
+	if len(r.MFAHeaderVals) != 0 {
+		for _, mfaHeaderVal := range r.MFAHeaderVals {
+			req.Header.Add("X-Vault-MFA", mfaHeaderVal)
+		}
+	}
+
+	if r.PolicyOverride {
+		req.Header.Set("X-Vault-Policy-Override", "true")
+	}
+
+	var result *Response
+	resp, err := c.c.config.HttpClient.Do(req)
 	defer resp.Body.Close()
 
+	if err != nil {
+		return err
+	}
+
+	if resp == nil {
+		return nil
+	}
+
+	// Check for a redirect, only allowing for a single redirect
+	if resp.StatusCode == 301 || resp.StatusCode == 302 || resp.StatusCode == 307 {
+		// Parse the updated location
+		respLoc, err := resp.Location()
+		if err != nil {
+			return err
+		}
+
+		// Ensure a protocol downgrade doesn't happen
+		if req.URL.Scheme == "https" && respLoc.Scheme != "https" {
+			return fmt.Errorf("redirect would cause protocol downgrade")
+		}
+
+		// Update the request
+		req.URL = respLoc
+
+		// Retry the request
+		resp, err = c.c.config.HttpClient.Do(req)
+		if err != nil {
+			return err
+		}
+	}
+
+	result = &Response{Response: resp}
+	if err := result.Error(); err != nil {
+		return err
+	}
+
 	return nil
 }
 
diff --git a/changelog/14269.txt b/changelog/14269.txt
new file mode 100644
index 0000000000000..529b7c6264299
--- /dev/null
+++ b/changelog/14269.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+ api/sys/raft: Update RaftSnapshotRestore to use net/http client allowing bodies larger than allocated memory to be streamed
+```